Add permissions for read maxfg debugfs am: 03c6806df9 am: e74bb8aa68

Original change: https://googleplex-android-review.googlesource.com/c/device/google/gs101-sepolicy/+/23577705

Change-Id: I3068d879a5c03524ba06150f01e7baee7e920571
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>