mmc: msm_sdcc: reset sd card at boot time

As per sd spec, if a sd card initialized in UHS mode needs to be
reinitialized, then the card should be powered off and then powered
on before proceeding with initialization again. Otherwise the sd
card reports it does not support UHS mode and can't be initialized as
an UHS card.

Currently sd card could be left powered on either because its regulator
is marked as always on or because the sd card was not run-time suspended
at the time of reboot. As a result on reboot, the sd card is not detected
as an UHS card. In order to prevent this the sd card is powered off and
then powered on at boot time.

CRs-fixed: 369644
Change-Id: Ic44fa005a1ac2d59d174b320e5e80dd5323876c3
Signed-off-by: Krishna Konda <kkonda@codeaurora.org>