mmc: sdhci-of-esdhc: use 1/2 periperhal clock for ls1088a

The eSDHC on LS1088A platform uses 1/2 peripheral clock as base
clock.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Link: https://lore.kernel.org/r/20191216091911.14840-1-yangbo.lu@nxp.com


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