meson: odroid-c2: enable Ethernet support through the device tree

Remove the device definition from board file, update the driver with
the new compatible property and update config with necessary options.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/odroid-c2_defconfig b/configs/odroid-c2_defconfig
index 808bbc2..3e9ef68 100644
--- a/configs/odroid-c2_defconfig
+++ b/configs/odroid-c2_defconfig
@@ -14,6 +14,9 @@
 CONFIG_OF_CONTROL=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_DM_ETH=y
+CONFIG_ETH_DESIGNWARE=y
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_MESON_GXBB=y
 CONFIG_DEBUG_UART=y
 CONFIG_DEBUG_UART_MESON=y
 CONFIG_DEBUG_UART_BASE=0xc81004c0