mmc: sdhci-of-esdhc: fix serious issue clock is always disabled

This patch is to fix a serious issue that clock is always disabled
in esdhc_of_set_clock().

Fixes: 1b21a701

 ("mmc: sdhci-of-esdhc: fix clock setting for different controller versions")
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Link: https://lore.kernel.org/r/20200120094835.28050-1-yangbo.lu@nxp.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>