Make audio*-base.h files autogenerated again

Major change: audio-base.h is generated from "core" types.hal,
new file audio_common-base.h is generated from "common" types.hal.

In order to be able to add system-only constants to generated
enums, the latter are made anonymous, values got "HAL_" prefix.
Then in system/audio.h a full enum is constructed.

Removed audio_drain_type_t from exported, as it belongs to
libhardware only.

Added missing enums that were introduced at the system side
only in Android R.

Bug: 122858783
Test: m
Change-Id: I8c017912395a03beacea077fd562fae2329ad975
Merged-In: I8c017912395a03beacea077fd562fae2329ad975