riscv: defconfig: spacemit: enable sdhci driver for K1 SoC

Enable sdhci driver support for SpacemiT K1 SoC, so eMMC storage
will be probed and activated, Tested on the Banana Pi BPI-F3 board.

Signed-off-by: Yixun Lan <dlan@gentoo.org>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

Author: dlan17

arch/riscv/configs/defconfig

@@ -229,6 +229,7 @@ CONFIG_MMC=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_PLTFM=y
 CONFIG_MMC_SDHCI_OF_DWCMSHC=y
+CONFIG_MMC_SDHCI_OF_K1=y
 CONFIG_MMC_SDHCI_CADENCE=y
 CONFIG_MMC_SPI=y
 CONFIG_MMC_DW=y