[LSC] Add LOCAL_LICENSE_KINDS to external/libxaac

Added SPDX-license-identifier-Apache-2.0 to:
  Android.bp
  fuzzer/Android.bp
  test/Android.bp

Bug: 68860345
Bug: 151177513
Bug: 151953481

Test: m all

Exempt-From-Owner-Approval: janitorial work
Change-Id: I8f70bf816b41ad6d7bb4e473eaab96cc53dc4dde
3 files changed