fb: statusbar reflect am/pm based on the global user settings 12h/24h format (1/2)

Change-Id: I7d6eec4d62f0e1072f11e8e131608b78f17539d9
fb: do not call every time settings on clock intents

only needed for configuration change.

Change-Id: Ie6db0e8a3abca83f5ea6c25f39124672e06ac4ff