mmc: mtk-sd: add support for MediaTek MT7620/MT7628 SoCs

This patch adds mmc support for MediaTek MT7620/MT7628 SoCs.

diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 18af076..85fd190 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -698,7 +698,7 @@
 
 config MMC_MTK
 	bool "MediaTek SD/MMC Card Interface support"
-	depends on ARCH_MEDIATEK
+	depends on ARCH_MEDIATEK || ARCH_MTMIPS
 	depends on BLK && DM_MMC
 	depends on OF_CONTROL
 	help