Camera: squashed shutter speed commits from CM

Add a setting for Shutter Speed

Change-Id: Ieebe50a4be04e7fea9301da63c008e36f4ec0dbd

Util: remove redundant check for ShutterSpeed

Change-Id: I1bd8c356137225d9a4c1414ef6a07a60f7200c13

show the actual shutter speed

Change-Id: I85255aa3c790583708bd5bac209bdf9a5fd73497