media: ov5640: Remove unused 'framerate' parameter

The 'current framerate' parameter passed to ov5640_try_fmt_internal() is
unsued. Drop it.

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>