Merge "system/common: Enforce -Wmissing-prototypes" into main am: 3e845a7e am: d4b21be6

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/3507142



Change-Id: I5b8505f7d1224073b2a081e8a5a1cbffc42d2bff
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>