media: dt-bindings: adi,adv7180: add VPP and CSI register maps

Different variants of the ADV7280 chip have up to three register maps.
The availability of the CSI and VPP register maps depends on the chip
variant. The address of the additional register maps depends on the
board design and other chips on the I2C but. They may be programmed via
registers in the main register map.

Allow to specify the addresses of the VPP and CSI register maps in the
device tree to solve I2C address conflicts on a board level.

The CSI and VPP register maps are always optional to allow backwards
compatibility with existing device trees which may rely on the default
address.

Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

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