mmc: sdhci-of-arasan: Add support for Intel Keem Bay

Intel Keem Bay SoC eMMC/SD/SDIO controller is based on
Arasan SD 3.0 / eMMC 5.1 host controller IP.

However, it does not support 64-bit access as its AXI interface
has 32-bit address ports.

Signed-off-by: Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20200526062758.17642-3-wan.ahmad.zainie.wan.mohamad@intel.com


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