Merge changes I450634af,Ifa12df68,I354095d1,Ib88a5957,I754d1bc2, ... into main

* changes:
  BUILD.gn: Remove cflag -Wno-unused-parameter
  system: Enforce -Wunused-parameter
  system/osi/test/fuzzers: Enforce -Wunused-parameter
  system/audio_bluetooth_hw/Android.bp: Enforce -Wunused-parameter
  system/stack/test/fuzzers: Enforce -Wunused-parameter
  system/bta/Android.bp: Enforce -Wunused-parameter
  system/profile/avrcp/Android.bp: Enforce -Wunused-parameter
  system/device/Android.bp: Enforce -Wunused-parameter
  system/audio_hal_interface/Android.bp: Enforce -Wunused-parameter
  system/osi/Android.bp: Enforce -Wunused-parameter
  system/stack/Android.bp: Enforce -Wunused-parameter
  system/gd/Android.bp: Enforce -Wunused-parameter
  system/btif/Android.bp: Enforce -Wunused-parameter