media: dt-bindings: phy: phy-rockchip-dphy-rx0: move rockchip dphy rx0 bindings out of staging

Move phy-rockchip-dphy-rx0 bindings to Documentation/devicetree/bindings/phy

Verified with:
make ARCH=arm64 dt_binding_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/phy/rockchip-mipi-dphy-rx0.yaml

Signed-off-by: Helen Koike <[email protected]>
Acked-by: Rob Herring <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

Author: Helen Koike