Merge "Revert "ANDROID: gralloc: Temporarily disable PixelFormat::R_8"" am: e4fc0b8356 am: f900bc8d9d am: cd4f13f364

Original change: https://android-review.googlesource.com/c/platform/external/minigbm/+/2517995

Change-Id: Ic84e75d2fd195a627101702efebfdc78c293f25c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>