Add permissions for read maxfg debugfs am: 03c6806df9 am: 794d80976f am: 726c8b19a6 am: 9fbfcd7664

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

Change-Id: Ic7fa2ab81e5bfaddbe542b92a3c81383312d578e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>