mmc: msm_sdcc: check for pending_resume in SDCC system suspend

If system comes out of suspend, msmsdcc_pm_resume() sets the
host->pending_resume flag if the SDCC wasn't runtime suspended.
Now if the system again goes to suspend without any SDCC activity
then host->pending_resume flag will remain set which may cause the SDCC
resume to happen first and then suspend.

To avoid this unnecessary resume/suspend, make sure that pending_resume
flag is cleared before calling the msmsdcc_runtime_suspend().

CRs-Fixed: 438081
Change-Id: I2b667bec704f938a532d4780dd9b7937e2eb12c7
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>