dt-bindings: phy: amlogic,g12a-mipi-dphy-analog: drop unneeded reg property and example

The amlogic,g12a-mipi-dphy-analog is a feature of the simple-mfd
amlogic,meson-axg-hhi-sysctrl system control register zone which is an
intermixed registers zone, thus it's very hard to define clear ranges for
each SoC controlled features even if possible.

The amlogic,g12a-mipi-dphy-analog was wrongly documented as an independent
register range, which is not the reality, thus fix the bindings by dropping
the reg property now it's referred from amlogic,meson-gx-hhi-sysctrl.yaml
and documented as a subnode of amlogic,meson-axg-hhi-sysctrl.

Also drop the unnecessary example, the top level bindings example should
be enough.

Fixes: 76ab79f972 ("dt-bindings: phy: add Amlogic G12A Analog MIPI D-PHY bindings")
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20231124-amlogic-v6-4-upstream-dsi-ccf-vim3-v9-4-95256ed139e6@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/amlogic,g12a-mipi-dphy-analog.yaml

@@ -16,20 +16,8 @@ properties:
   "#phy-cells":
     const: 0
 
-  reg:
-    maxItems: 1
-
 required:
   - compatible
-  - reg
   - "#phy-cells"
 
 additionalProperties: false
-
-examples:
-  - |
-    phy@0 {
-          compatible = "amlogic,g12a-mipi-dphy-analog";
-          reg = <0x0 0xc>;
-          #phy-cells = <0>;
-    };