dt-bindings: net: Add support for Sophgo SG2044 dwmac

The GMAC IP on SG2044 is almost a standard Synopsys DesignWare
MAC (version 5.30a) with some extra clock.

Add necessary compatible string for this device.

Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20250307011623.440792-2-inochiama@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>