media: i2c: imx258: Make V4L2_CID_VBLANK configurable.
The values and ranges of V4L2_CID_VBLANK are all computed,
so there is no reason for it to be a read only control.
Remove the register values from the mode lists, add the
handler, and remove the read only flag.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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