[media] ov772x: avoid calling ov772x_select_params() twice

Merge ov772x_s_fmt into ov772x_set_fmt.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>