mmc: sdhci-msm: Disable controller clocks in suspend

Generally, during card suspend we call mmc_power_off
and disable controller clocks.
Now consider below sequence of events :
suspend -> resume -> suspend.
1) During first platform suspend, mmc_power_off will
be called and clocks would be disabled.
2) As a part of platform resume, we enable controller
clocks and defer card resume when
MMC_BUSRESUME_NEEDS_RESUME flag is set.
3) During next suspend we check if card is already
suspended (i.e MMC_BUSRESUME_NEEDS_RESUME is set)
and return without doing actual suspend (where we
call mmc_power_off and disable controller clocks).

So in this scenario, controller clocks will remain ON
even though card state is SUSPENDED.

Fix this by disabling controller clocks during suspend
if controller clock was ON.

CRs-Fixed: 1088893
Change-Id: Id54a15d7f6a7131dab609eec1db158c64ada83ce
Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>