Keyguard: Change SUB label to SIM

Change-Id: If3d92426e1c975870584f46d63c3ee0dfbfb3a52
msim: initialize sim icon to the known state

When system ui gets killed (for instance, during a theme change), MultiSimNetworkController may not receive the SIM_STATE_CHANGED for both sim cards. Instead of initializing the sim to "ready", query for the actual state at initialization.
Merge remote-tracking branch 'upstream/kitkat' into kitkat