dt-bindings: mmc: sdhci-of-dwcmhsc: Add Sophgo SG2044 support

The sdhci IP of SG2044 is similar to it of SG2042. They
share the same clock and controller configuration.

Add compatible string for SG2044.

Signed-off-by: Inochi Amaoto <[e-mail]>
Reviewed-by: Chen Wang <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml

···
               - rockchip,rk3562-dwcmshc
               - rockchip,rk3576-dwcmshc
           - const: rockchip,rk3588-dwcmshc
+      - items:
+          - const: sophgo,sg2044-dwcmshc
+          - const: sophgo,sg2042-dwcmshc
       - enum:
           - rockchip,rk3568-dwcmshc
           - rockchip,rk3588-dwcmshc