linux-imx

mmc: sdhci-esdhc-imx: make sure usdhc clock enabled during suspend

When suspend usdhc, it will access usdhc register. So usdhc clock
should be enabled, otherwise the access usdhc register will return
error or cause system.

Take this into consideration, if system enable a usdhc and do not
connect any SD/SDIO/MMC card, after system boot up, this usdhc
will do runtime suspend, and close all usdhc clock. At this time,
if suspend the system, due to no card persent, usdhc runtime resume
will not be called. So usdhc clock still closed, then in suspend,
once access usdhc register, system hung or bus error return.

This patch make sure usdhc clock always enabled while doing usdhc
suspend.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>