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

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



Change-Id: I72915488b08fb573b8c71791252f06628e62ae04
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>