Missing back button on MultiSimSettings ActionBar

Fixed missing back button on ActionBar (default Settings behavior on
submenus) by adding "parentActivityName" property to MultiSimSettings
activity.

Change-Id: I60a1123be29d81c8232e0acee1ac9544bf9b32e6
Merge "Missing back button on MultiSimSettings ActionBar" into cm-11.0
Merge remote-tracking branch 'upstream/cm-11.0' into cm-11.0