ANDROID: Update drm_hwc pre/postsubmit am: a42c007e78

Original change: https://android-review.googlesource.com/c/platform/external/drm_hwcomposer/+/3447528

Change-Id: Ideb4614dcb0725f06af2b8879c3cbccb6ecbdb3c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>