Adding METADATA file to libdrm am: 31b8ae69d9 am: ed0a0cde4e am: ac21f6e34c am: b37494c0d9

Original change: https://android-review.googlesource.com/c/platform/external/libdrm/+/2441386

Change-Id: Ie715a628ddac77e7ac6621a35a964a32b807a50d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>