dt-bindings: serial: ingenic: Add support for the JZ4750/55 SoCs

These SoCs UART block are the same as JZ4725b' one, the difference is
outside of the block - it is in the clock generation unit (CGU).
The difference requires to make a quirk for early console init.
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Siarhei Volkau <lis8215@gmail.com>
Link: https://lore.kernel.org/r/20221031184041.1338129-2-lis8215@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/serial/ingenic,uart.yaml

@@ -20,6 +20,7 @@ properties:
     oneOf:
       - enum:
           - ingenic,jz4740-uart
+          - ingenic,jz4750-uart
           - ingenic,jz4760-uart
           - ingenic,jz4780-uart
           - ingenic,x1000-uart
@@ -31,6 +32,9 @@ properties:
       - items:
           - const: ingenic,jz4725b-uart
           - const: ingenic,jz4740-uart
+      - items:
+          - const: ingenic,jz4755-uart
+          - const: ingenic,jz4750-uart
 
   reg:
     maxItems: 1