Merge "Start listening to telephony changes in #start()" am: dd2dd2baa2 am: 5e1899796f am: ad68e73f25

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2222847

Change-Id: Ic1d0e5ce407320e23560ac55796435338c8990a2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>