MLK-14774 mmc: sdhci-esdhc-imx: restore pins state after suspend

MLK-14774 mmc: sdhci-esdhc-imx: restore pins state after suspend

After commit 3e3274ab9ff3 ("mmc: sdhci-esdhc-imx: Use common
sdhci_suspend|resume_host()"), we lost the pins state store and save
in common sdhci_pltfm_{suspend|resume} API which results in the
pins state lost in state un-retainable suspend/resume, then
CMD transfer will meet timeout subsequently.

Due to sdhci_pltfm_{suspend|resume} API becomes static after
that commit later, we then do manual pins state save and restore
in our platform suspend/resume API instead.

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>