Camera: Add support for manual 3A.

Add manual white balance mode.
   user can set the specific cct to lock the white balance.Just as other
   white balance mode, it will lock the white balance once it's set, the
   only difference it that the cct value is set from app.

Add manual focus mode
   allow app to set the focus distance with DAC value or actuator
   step value. Once the value is set, the focus distance is locked
   unless app switch it back to automatically mode

Change-Id: I0c08ad0cea27284645e9e710c26844ca24a5c477