Merge "DRM HAL README.md" am: d4a24d77 am: 45110121 am: 63fa212f

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2395093



Change-Id: I15b7d31b8f530fa3d2e2d9d655f334d6e62e53f7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>