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>

arch/Kconfig

@@ -62,6 +62,9 @@ config PPC
 config RISCV
 	bool "RISC-V architecture"
 	select SUPPORT_OF_CONTROL
+	select OF_CONTROL
+	select DM
+	imply CMD_DM
 
 config SANDBOX
 	bool "Sandbox"

configs/ax25-ae350_defconfig

@@ -15,12 +15,10 @@ CONFIG_CMD_SF_TEST=y
 # 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