SystemUI: Avoid NPEs during status bar recreation for MSIM

PS2:
   * Clear the subs views on recreation
   * Unregister receivers on recreation

Change-Id: Id131ffac497f46a753a97b479823e51fda7c412c
Merge branch 'cm-11.0' into kk_mkt

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/policy/MSimNetworkController.java

Change-Id: Ic42df1506f07067af909fe028055d955c34d84fc