Camera: Add support for 4x zoom and to pass maximum zoom value to upper
layers.

Add support for 4X zoom by calling setCrop of overlay or mdp blit with crop
information. Also, get the maximum zoom value from driver and pass the
same in camera parameters. Changed the zoom step size from 6 to 1 for
smooth zoom.

CRs-Fixed: 222381, 222382
2 files changed