[LSC] Add LOCAL_LICENSE_KINDS to external/firebase-messaging Added SPDX-license-identifier-Apache-2.0 to: Android.bp Bug: 68860345 Bug: 151177513 Bug: 151953481 Test: m all Exempt-From-Owner-Approval: janitorial work Change-Id: I7a2cc93de77146636683c92aae0acf9e0077593f