mmc: sdhci-msm: Add wakeup functionality support for sdio cards

This adds external GPIO wakeup support to sdhci-msm driver
for sdio cards.

Also enables clk gating only in system Suspend/Resume for SDIO card.

Also add the below fixes from 4.9 kernel :

c363224b: Fix wakeup functionality for SDIO
61fc5bf6: Remove flag MMC_PM_WAKE_SDIO_IRQ in mmc_resume_host
a7a2a82e: Set sdio_pending_processing default state to false.

Change-Id: Id6b26e8861683ab12a2323214d7946377031d314
Signed-off-by: Sarthak Garg <sartgarg@codeaurora.org>