Add more pertinent directories to the cleanspec after the APEX split.

Test: Build
Bug: 135753770
Change-Id: I060e1b3edaaebbc1395a6f0d3943a5938facd008
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 0ba486a..43204fd 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -94,6 +94,8 @@
 # Remove all APEX artifacts for the Runtime/ART APEX split.
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/apex)
 $(call add-clean-step, rm -rf $(HOST_OUT)/apex)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/apex)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/symbols/apex)
 
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST