media: ov5640: set correct default format for CSI-2 mode

In commit a89f14bb ("media: ov5640: Split DVP and CSI-2 formats"),
it splits format list for DVP and CSI-2 mode, but the default format
defined in commit 90b0f355 ("media: ov5640: Implement init_cfg")
is only supported by DVP mode, so define a new default format for
CSI-2 mode.

Signed-off-by: Guoniu.zhou <guoniu.zhou@nxp.com>
Reviewed-by: Jai Luthra <j-luthra@ti.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>