msm8974-common: Fixup CameraWrapper for L

  -Also clean up code and get rid of warnings.
   Clean up from Arne Coucheron works on other samsung wrappers.

  -Requires device tree to include a CameraParametersExtra.h
   for the specific device.

Change-Id: Icab1b9ec17710861f735a05dcdd87dac932c63c2