sepolicy: minigbm_msm: fix vendor.minigbm.debug prop access denials am: 4746684811 am: e6ebfb6e97 am: 2352d0e529 am: f43930e007 am: cef726144d

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/2752086

Change-Id: I134b9b905454a7f4c5425cd55581fc551c9942bc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>