platform: msm_shared: Fix sdcc driver hang issue

If the higher order bootloaders use sdhc mode & LK uses legacy mode
then LK mmc driver hangs in waiting for ready status from controller.
During init sequence of lk legacy mmc driver we should disable sdhc mode
and reset the controller for a clean start.

CRs-Fixed: 596424
Change-Id: I91729af49ccfe0d4e756c4d36f7de23bc0777f80
2 files changed