[LSC] Add LOCAL_LICENSE_KINDS to build/soong

Added SPDX-license-identifier-Apache-2.0 to:
  java/core-libraries/Android.bp
  mk2rbc/Android.bp

Bug: 68860345
Bug: 151177513
Bug: 151953481

Test: m all

Exempt-From-Owner-Approval: janitorial work
Change-Id: Iaf8546fc945b04b71cd5cb1c7c16a9e15f608d02