Add aconfig flag for fixing AAudio stream issue with AIDL

Added a flag for the behavior of allowing the libaudiohal@aidl
to close and re-open HAL AAudio streams while keeping the same
StreamHalInterface instance for the framework. This aligns
with the HIDL behavior that was possible due to existence
of `createMmapBuffer` HAL method which was removed in AIDL.

aconfig flags: Flag: com.android.media.audio.fix_aaudio_stream_reopen_in_libaudiohal_aidl
Bug: 274456992
Change-Id: I00d8b370621d8cbe979cccf139808a6ada32eee8
Test: m