mmc: mmci: clarify DDR timing mode between SD-UHS and eMMC
mmc: mmci: clarify DDR timing mode between SD-UHS and eMMC

Added MMC_DDR52 as eMMC's DDR mode distinguished from SD-UHS.

CC: Russell King <ba324ca7b1c77fc20bb970d5aff6eea9377918a5@arm.linux.org.uk>
Signed-off-by: Seungwon Jeon <a133bc924ee401eac4c4f97927180f14b8a9baec@samsung.com>
Signed-off-by: Ulf Hansson <fe47b31f388f85ce6ddf64bf3a0cf6b46077d0e6@linaro.org>
Signed-off-by: Chris Ball <711c73f64afdce07b7e38039a96d2224209e9a6c@printf.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs