mmc: Kconfig: Add RISCV and CSKY for MMC_DW

Synopsys DesignWare MMC controller could be used in RISC-V and
C-SKY architectures.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/1596887102-9743-1-git-send-email-guoren@kernel.orgSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/Kconfig

@@ -777,7 +777,7 @@ config MMC_CAVIUM_THUNDERX
 
 config MMC_DW
 	tristate "Synopsys DesignWare Memory Card Interface"
-	depends on ARC || ARM || ARM64 || MIPS || COMPILE_TEST
+	depends on ARC || ARM || ARM64 || MIPS || RISCV || CSKY || COMPILE_TEST
 	help
 	  This selects support for the Synopsys DesignWare Mobile Storage IP
 	  block, this provides host support for SD and MMC interfaces, in both