With these properties added, sd cards inserted into hikey can work at UHS
mode if they have such capability.

Note, this depends on HiKey UHS-SD support patch [1] to work properly.
If you didn't add this patch, but added sd-uhs- properties into dwmmc_1,
then sd cards cannot work. As of this post, patch [1] has been integrated
into maintainer's next branch [2].

[1]: [V4] mmc: dw_mmc-k3: UHS-SD card for Hisilicon Hikey,
 https://patchwork.kernel.org/patch/9262515/
[2]: https://git.linaro.org/people/ulf.hansson/mmc.git next
 commit a8a5b2909cfc ("mmc: dw_mmc: k3: UHS-SD card for Hisilicon Hikey")

cc: Ulf Hansson <ulf.hansson@linaro.org>
cc: Jaehoon Chung <jh80.chung@samsung.com>
cc: Jinguojun <kid.jin@hisilicon.com>
Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>