Merge "system/bta: Enforce -Wmissing-prototypes" into main am: dc770993 am: 1b775f7b

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/3506891



Change-Id: I17b9bcc95c240dd55f52723308b4d9871e570008
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>