Make mPermissionMonitor in ConnectivityService private am: f360aa6058 am: 328aac1741

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2405717

Change-Id: Iecd94cb089863c874596af6cbe11f82cd26e06e0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>