Android Mainline 12.0.0 Release 56 (7920574,com.google.android.tzdata3)
Add LICENSE file for libdrm am: 4a39b41b8b

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/libdrm/+/15069527

Change-Id: Id6592a6355c8dd60c22b3ce360bd35e5230f99db