[LSC] Add LOCAL_LICENSE_KINDS to external/libtextclassifier

Added SPDX-license-identifier-Apache-2.0 to:
  coverage/Android.bp
  java/Android.bp
  java/tests/instrumentation/Android.bp
  jni/Android.bp
  native/Android.bp
  notification/Android.bp
  notification/tests/Android.bp

Added SPDX-license-identifier-Apache-2.0 legacy_unencumbered to:
  Android.bp
  abseil-cpp/Android.bp

Bug: 68860345
Bug: 151177513
Bug: 151953481

Test: m all

Exempt-From-Owner-Approval: janitorial work
Change-Id: Ibd0d30dc0908aa996ad45999b08448734c592dfb
9 files changed