media: ov5640: Change CSI-2 timings to comply with FPS

Now that the frame duration can be controlled by tuning the VBLANK
duration in CSI-2 mode, fix all modes definitions to comply with the
reported FPS.

All modes run at 30 FPS except for full-resolution mode 2592x1944
which runs at 15FPS.

Tested on a 2 data lanes setup in UYVY and RGB565 modes in CSI-2 mode.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>