mips: mt76xx: Kconfig: Add ethernet and GPIO support

Imply DM_ETH and DM_GPIO for ARCH_MT7620, as this platform now supports
ethernet and GPIO as well.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 6d646ef..8278c68 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -74,6 +74,8 @@
 	imply CMD_DM
 	select DISPLAY_CPUINFO
 	select DM
+	imply DM_ETH
+	imply DM_GPIO
 	select DM_SERIAL
 	imply DM_SPI
 	imply DM_SPI_FLASH