Fix clean InProcessTethering fail problem

CleanSpec only respect root of a git project.
Remove packages/Tethering/CldanSpec.mk because it never
be read.

Bug: 144320246
Test: manual build InProcessTethering and observed it is removed
      after adding new clean step.

Change-Id: I58750e4a1fe11018d83da1ebf828d1b3134ec765
Merged-In: I58750e4a1fe11018d83da1ebf828d1b3134ec765
diff --git a/CleanSpec.mk b/CleanSpec.mk
index f7a2858..3047dd7 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -255,6 +255,7 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/CaptivePortalLogin)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/framework/ext.jar)
 $(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/JAVA_LIBRARIES/framework_intermediates/src/telephony/java/com/google/android/mms)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/priv-app/InProcessTethering)
 # ******************************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST ABOVE THIS BANNER
 # ******************************************************************
diff --git a/packages/Tethering/CleanSpec.mk b/packages/Tethering/CleanSpec.mk
deleted file mode 100644
index 30bdd58..0000000
--- a/packages/Tethering/CleanSpec.mk
+++ /dev/null
@@ -1,58 +0,0 @@
-# Copyright (C) 2019 The Android Open Source Project
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-# If you don't need to do a full clean build but would like to touch
-# a file or delete some intermediate files, add a clean step to the end
-# of the list.  These steps will only be run once, if they haven't been
-# run before.
-#
-# E.g.:
-#     $(call add-clean-step, touch -c external/sqlite/sqlite3.h)
-#     $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/STATIC_LIBRARIES/libz_intermediates)
-#
-# Always use "touch -c" and "rm -f" or "rm -rf" to gracefully deal with
-# files that are missing or have been moved.
-#
-# Use $(PRODUCT_OUT) to get to the "out/target/product/blah/" directory.
-# Use $(OUT_DIR) to refer to the "out" directory.
-#
-# If you need to re-do something that's already mentioned, just copy
-# the command and add it to the bottom of the list.  E.g., if a change
-# that you made last week required touching a file and a change you
-# made today requires touching the same file, just copy the old
-# touch step and add it to the end of the list.
-#
-# *****************************************************************
-# NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST ABOVE THE BANNER
-# *****************************************************************
-
-# For example:
-#$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/APPS/AndroidTests_intermediates)
-#$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/JAVA_LIBRARIES/core_intermediates)
-#$(call add-clean-step, find $(OUT_DIR) -type f -name "IGTalkSession*" -print0 | xargs -0 rm -f)
-#$(call add-clean-step, rm -rf $(PRODUCT_OUT)/data/*)
-
-$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/priv-app/Tethering)
-$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/priv-app/InProcessTethering)
-$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/APPS/InProcessTethering*)
-$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/APPS/InProcessTethering*)
-$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system_other/system/priv-app/InProcessTethering)
-$(call add-clean-step, rm -rf $(PRODUCT_OUT)/apex/com.android.tethering)
-$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/apex/com.android.tethering.apex)
-$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/ETC/com.android.tethering*)
-
-# ******************************************************************
-# NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST ABOVE THIS BANNER
-# ******************************************************************