configs: meson: use Designware glue driver for Amlogic Meson8b & later SoCs

Use the proper Synopsys DWMAC Meson8b glue to handle the ethernet link type.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/configs/libretech-s912-pc_defconfig b/configs/libretech-s912-pc_defconfig
index c54304a..a14ac20 100644
--- a/configs/libretech-s912-pc_defconfig
+++ b/configs/libretech-s912-pc_defconfig
@@ -42,7 +42,7 @@
 CONFIG_MDIO_MUX_MMIOREG=y
 CONFIG_PHY_REALTEK=y
 CONFIG_DM_ETH=y
-CONFIG_ETH_DESIGNWARE=y
+CONFIG_ETH_DESIGNWARE_MESON8B=y
 CONFIG_MESON_GXL_USB_PHY=y
 CONFIG_PINCTRL=y
 CONFIG_PINCTRL_MESON_GXL=y