mmc: msm_sdcc: set DDR timing mode before setting the clock rate

Setting DDR timing mode in controller before setting the clock
rate will make sure that card don't see the double clock rate
even for very small amount duration. Some eMMC cards seems to lock
up if they see clock frequency > 52MHz.

Change-Id: I8105cf52c07df01d66c3e15304ea10e2cbc498ff
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>