media: staging: dt-bindings: phy-rockchip-dphy-rx0: remove non-used reg property

reg property is not used in Rockchip MIPI DPHY RX0 bindings, thus remove
it.
Suggested-by: Johan Jonker <jbx6244@gmail.com>
Signed-off-by: Helen Koike <helen.koike@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/phy-rockchip-dphy-rx0/Documentation/devicetree/bindings/phy/rockchip-mipi-dphy-rx0.yaml

@@ -18,9 +18,6 @@ properties:
   compatible:
     const: rockchip,rk3399-mipi-dphy-rx0
 
-  reg:
-    maxItems: 1
-
   clocks:
     items:
       - description: MIPI D-PHY ref clock