camera: add power mode support

Based on commit 7036d66bec7697160ba1b2e255f1e7fae0c8c435 from CAF,
branch ics_chocolate.

Change-Id: I8a60668b18980fd5e6f9dd341db5a8a63deb99d0
Camera: add additional ISO modes (2/2)

Change-Id: I3460c3de4cbef467430673146a9ddb2fdc8f5032