media: dt-bindings: media: imx335: Add supply bindings

Add the bindings for the supply references used on the IMX335.

Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>