Expose libraries for moving mediametrics to module

export a few libraries to the media apex and add
explicit declarations of min_sdk for those libraries.
Groundwork for moving mediametrics from framework to module.

bpfmt of libaaudio/Android.bp as indicated by repo upload

Bug: 189976186
Test: build
Test: dumpsys media.metrics
Test: atest CtsMediaHostTestCases
Flag: EXEMPT refactor
Change-Id: I65b41bd057862ca36ff62543fc05f75f639aab9b