mmc: core: Add retuning to cmdq path

In cmdq mode, do tuning if required before issueing request to
controller. This is required when we are in HS200 or HS400 without
enhanced strobe mode and we had gated the clock. So after ungating the
clock, do retuning.

Change-Id: I8c506a69053022fda65d78838f09e905519f07cc
Signed-off-by: Vijay Viswanath <vviswana@codeaurora.org>