MLK-9834 mmc: sdhci-esdhc-imx: fix SD3.0 failed to resume if M/F is enabled

Due to the power lost in suspend if Mega/Fast is enabled which is a new
feature introduced, the static settings like tuning control in probe()
function of controller will be lost which results in the later resume
failed on tuning routine for SD3.0 cards(SDR50/SDR104).

This patch moves the tunning setting from probe() function into
register setting path before the tuning is executed.
Then the tuning setting becomes dynamically and re-set again after
resume for a SD3.0 card when doing tuning.

Signed-off-by: Dong Aisheng <b29396@freescale.com>
(cherry picked from commit 2fb6a74b8b91dad7e57d65a57eabd422a4acc25e)