mmc: omap_hsmmc: add signal voltage selection support
I/O data lines of UHS SD card operates at 1.8V when in UHS speed mode (same is true for eMMC in DDR and HS200 modes). Add support to switch signal voltage to 1.8V in order to support UHS cards and eMMC HS200 and DDR modes. Signed-off-by: NKishon Vijay Abraham I <kishon@ti.com> Signed-off-by: NJean-Jacques Hiblot <jjhiblot@ti.com>
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