camera: Add support for sending raw commands

 * Certain camera drivers need magic commands to select special modes
   such as ZSL or HDR. Add support for sending raw commands from
   applications.

Change-Id: I512a765c7a67ffd2877e465cf6493ffc2b3b54ac
Fix SystemUI memory leaks on theme changes.

Change-Id: I7224e707ae2452a858c7a16ae7a56f6bf19a098f