Moved contents of clang_cflags into cflags am: 5cfa62ca29 am: 69aab83963 am: c62ec1000b am: 898868785e

Original change: https://android-review.googlesource.com/c/platform/system/gatekeeper/+/2069578

Change-Id: Ibe4b867c69e43b28f716bda9643af92eefbbf787
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>