libhardware: make memtrack vendor only

Limit AOSP usage of historical HAL implementation interface to
avoid mistakes.

Bug: 37280010
Test: build
Change-Id: I6b5d1e162c665b232e41e0b10cde6959ead1b548
diff --git a/include/hardware/memtrack.h b/include/hardware/memtrack.h
deleted file mode 120000
index 3bc4448..0000000
--- a/include/hardware/memtrack.h
+++ /dev/null
@@ -1 +0,0 @@
-../../include_all/hardware/memtrack.h
\ No newline at end of file
diff --git a/include_all/hardware/memtrack.h b/include_vendor/hardware/memtrack.h
similarity index 100%
rename from include_all/hardware/memtrack.h
rename to include_vendor/hardware/memtrack.h