Fix kotlin nullable errors in PermissionController am: 09ff5781b3 am: 6d92f13520 am: a0fa7975d6 am: eca76d5f40

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Permission/+/2694575

Change-Id: I06c98fb7e8c43abab09ff86f8874a7d74a4e382d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>