phy: intel: Add Keem Bay eMMC PHY support

Add support for eMMC PHY on Intel Keem Bay SoC.

Signed-off-by: Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200913235522.4316-4-wan.ahmad.zainie.wan.mohamad@intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>