dt-bindings: i2c: maxim,max96712: Add bindings for Maxim Integrated MAX96712

Add bindings for Maxim Integrated MAX96712 deserializer. The MAX96712
deserializer converts GMSL2 or GMSL1 serial inputs into MIPI CSI-2 D-PHY
or C-PHY formatted outputs.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211230123354.623876-1-niklas.soderlund+renesas@ragnatech.se