riscv: kconfig: Imply DM support for some common drivers

This implies DM support for some common drivers that are used on
RISC-V.

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 694258c..c988c17 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -64,6 +64,15 @@
 	select SUPPORT_OF_CONTROL
 	select OF_CONTROL
 	select DM
+	imply DM_SERIAL
+	imply DM_ETH
+	imply DM_MMC
+	imply DM_SPI
+	imply DM_SPI_FLASH
+	imply BLK
+	imply CLK
+	imply MTD
+	imply TIMER
 	imply CMD_DM
 
 config SANDBOX