ARM: dts: msm: SDCC Regs Restore Once Resuming from CX Collapse for sdm845

Defines the restore-after-cx-collapse property for MMC driver.
This basically lets the driver know that software needs to save the SDCC
register contents before the CX collapse event and restore the SDCC
register contents after coming out of CX power collapse event.

Change-Id: Icfeb4faccb717607aac3e24a4432d1279ad5c775
Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>