[LSC] Add LOCAL_LICENSE_KINDS to frameworks/av

Added SPDX-license-identifier-Apache-2.0 to:
  media/codec2/hidl/plugin/Android.bp
  media/libmedia/tests/mediaplayer/Android.bp

Bug: 68860345
Bug: 151177513
Bug: 151953481

Test: m all

Exempt-From-Owner-Approval: janitorial work
Change-Id: I3f01a855d7d4dca3cabb40646d7d8b63ca1f130d