media: dt-bindings: marvell,mmp2-ccic: Allow power-domains property

On MMP3 the camera interface is on a separate power island. This
property tells the driver to enable it when appropriate.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20210121034130.1381872-3-lkundrak@v3.sk

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>