Cancel Emergency call warning and network preference switch notification

When SIM is removed, Emergency call warning notification and network
preference switch notification should be cancelled as they are no longer
valid after SIM removal. So, now cancelling those notifications based
on valid subId.

Bug: 161762382
Test: manual
Merged-in: I9640db04d977cc0c4b6cea8b0686bbb9891a56fa
Change-Id: I9640db04d977cc0c4b6cea8b0686bbb9891a56fa
(cherry picked from commit 7c7f0643)