camera: add power mode support

Based on commit 7036d66bec7697160ba1b2e255f1e7fae0c8c435 from CAF,
branch ics_chocolate.

Change-Id: I8a60668b18980fd5e6f9dd341db5a8a63deb99d0
Camera: add ISO mode support

Change-Id: Ied2075f950269990d836fc768b2c6c36088d494f
Camera : Powerkey shutter (1/2)

Allows user to take use power key to take pictures/videos

Change-Id: I85a1e1761199f4604672be42a3a5005227f5451a
Merge remote-tracking branch 'aokp/jb-mr1' into HEAD