platform: msm_shared: Add property for io switch

For some platforms the SDC controller is shared between
emmc and sd card. In such case the voltage switch should happen
to 1.8 for emmc card functionality. Add target specific property
to enable the IO_PAD power switch.

Change-Id: Ia5585fff31359f8bd5c7f3b9fb8e909a7e673a90
4 files changed