[media] V4L: OV5642:remove redundant code to set cropping w/h

This patch contains code change only to remove redundant
code to set priv->crop_rect.width/height in probe function.

Signed-off-by: Liu Ying <Ying.Liu@freescale.com>
Acked-by: Chris Lalancette <clalancette@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>