SystemUI (MSIM): Fix Airplane mode toggle issue using Quick Access menu.

onAirplaneModeChanged() in QuickSettingsModel class needs to be called from
MSimNetworkController class (for MSIM) to update Airplane widget in Quick
Access menu. Same code is missing in MSimNetworkController class.
Add notifySignalsChangedCallbacks() at MSimNetworkController class.

Change-Id: I214f679b377f26fb58b6165a52c5e12c860f5111
CRs-Fixed: 543170