[LSC] Add LOCAL_LICENSE_KINDS to system/core

Added SPDX-license-identifier-Apache-2.0 to:
  rootdir/Android.mk

Bug: 68860345
Bug: 151177513
Bug: 151953481

Test: m all
Change-Id: I19aaea76a932cc928bbc178c01a33fdc98b0cf16
1 file changed