board-msm7627a: mmc: Vote against idle power collapse when SDCC is active

Vote against idle power collapse during active SDCC
transfers help resolve an issue where the commands
sent to the card fail (due to timeout or CRC errors)
during SDCC resume.

CRs-Fixed: 328462
Change-Id: I7c3aa8155edeadc66ed21db03c0e069a59e415a8
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>