Fix MobileNetworkSettings crash for multi-SIM device

Crash happens when view of MobileNetworkSettings activity is updated
from view for id R.layout.network_setting to view for
id R.layout.common_tab_settings if two SIMs are inserted into multi-SIM
device. Because view for id R.id.network_setting_content is not found.
View for id R.id.network_setting_content must be present for
MobileNetworkFragment.

To avoid this illegal state, inflate view for
id R.layout.common_tab_settings to MobileNetworkFragment.

Test: manual - Checked that the Mobile network settings can be
displayed when two SIMs are inserted
Bug: 63127781

Change-Id: I2e88d7cbe9f889305d4ac796c2bf9f395374da7d
1 file changed