[media] ov772x: Stop sensor readout right after reset

The sensor starts streaming video as soon as it gets powered or is
reset. Disable the output in the reset function.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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