To improve signal strength notification after service state change

Signal bar level is wrong after user switch WFC. Because telephony don't send
signal strength notification after service state change.

Bug: 110189009
Test: manual - to check signal strength notification after service state
change. e.g. airplane mode on/off , preferred network mode change.

Change-Id: I27dccdb10769131c3b898f1145fe653a1349e774
Merged-In: I27dccdb10769131c3b898f1145fe653a1349e774