camera: Handle the num-jpegs-per-shutter mode

 * M7 will set this value to 1, but set the number of burst shots to 3.
 * We need to call takePicture on the hardware a number of times before
   accepting the jpeg.

Change-Id: I169ee3139e8643a39133d7385afe2f88982a1612
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_frameworks_av into kitkat