net: designware: add meson meson axg compatible

Add the compatible string for the upcoming Amlogic AXG SoC family.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/drivers/net/designware.c b/drivers/net/designware.c
index cdcc03f..4fa26ab 100644
--- a/drivers/net/designware.c
+++ b/drivers/net/designware.c
@@ -839,6 +839,7 @@
 	{ .compatible = "amlogic,meson6-dwmac" },
 	{ .compatible = "amlogic,meson-gx-dwmac" },
 	{ .compatible = "amlogic,meson-gxbb-dwmac" },
+	{ .compatible = "amlogic,meson-axg-dwmac" },
 	{ .compatible = "st,stm32-dwmac" },
 	{ }
 };