ARM: uniphier: select DM_ETH

drivers/net/smc911x.c has been converted to DM.

select DM_ETH to enable it for all the UniPhier platform boards.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ef7da27..21df1c4 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1582,6 +1582,7 @@
 	bool "Socionext UniPhier SoCs"
 	select BOARD_LATE_INIT
 	select DM
+	select DM_ETH
 	select DM_GPIO
 	select DM_I2C
 	select DM_MMC