Add a new known hash to drm am: 992d978c20

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/3288228

Change-Id: I75c5bc09d463e1d0697ef9368c48185fdafafed2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>