mmc: sdhci-msm: select pin drive type for each clock rate

SDHCI uses fixed two drive types, which are active and
sleep. This change adds supporting for choosing specific
drive type for each given clock rate. It is implemented
by selecting drive types, if given by device tree, after
clock rate is changed.

Change-Id: I45171f79f0b6a481ee51ef2673872eba756e5d0a
Signed-off-by: Can Guo <cang@codeaurora.org>