media: imx335: Set vblank immediately

media: imx335: Set vblank immediately

When the vblank v4l2 control is set, it does not get written to the
hardware unless exposure is also changed. Change the behavior such that
the vblank is written immediately when the control is set, as setting
the vblank without changing the exposure is a valid use case (such as
for changing the frame rate).

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>