riscv: kconfig: Select DM and OF_CONTROL

RISC-V is a pretty new architecture and should support DM and
OF_CONTROL by default.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
diff --git a/arch/Kconfig b/arch/Kconfig
index 49f0d44..694258c 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -62,6 +62,9 @@
 config RISCV
 	bool "RISC-V architecture"
 	select SUPPORT_OF_CONTROL
+	select OF_CONTROL
+	select DM
+	imply CMD_DM
 
 config SANDBOX
 	bool "Sandbox"
diff --git a/configs/ax25-ae350_defconfig b/configs/ax25-ae350_defconfig
index d64f078..ebcc52e 100644
--- a/configs/ax25-ae350_defconfig
+++ b/configs/ax25-ae350_defconfig
@@ -15,12 +15,10 @@
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_BOOTP_PREFER_SERVERIP=y
 CONFIG_CMD_CACHE=y
-CONFIG_OF_CONTROL=y
 CONFIG_OF_BOARD=y
 CONFIG_DEFAULT_DEVICE_TREE="ae350"
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_NET_RANDOM_ETHADDR=y
-CONFIG_DM=y
 CONFIG_CLK=y
 CONFIG_MMC=y
 CONFIG_DM_MMC=y