mmc: msm_sdcc: disable sdhci mode during probe

Now that bootloaders support sdhci mode, its possible for them
to leave the sdcc core in sdhci mode after loading the kernel
in ram and pass control to Linux for bootup. In that case if
sdcc driver was enabled, the core wont function as expected
since it happens to be in sdhci mode.

So for sdcc cores that support sdhci mode, disable SDHCi mode
before initializing the sdcc core during probe.

Change-Id: Ib9dfa7dd96d3c67979b51ea39dc4810cd44e5fd3
Signed-off-by: Krishna Konda <kkonda@codeaurora.org>