dt-bindings: mmc: spacemit,sdhci: add support for K1 SoC

Add support for the SD/eMMC Host Controller found in SpacemiT K1 SoC,
The controller supports data transmission of MMC, SDIO, SD protocol.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Yixun Lan <dlan@gentoo.org>
Link: https://lore.kernel.org/r/20250509-20-k1-sdhci-v3-1-526c35feaa20@gentoo.org


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>