linux-phytec-ti

mmc: host: omap_hsmmc: Support pbias and vmmc_aux to switch to 1.8v

Add support for vmmc_aux to switch to 1.8v. Also use "iov" instead of
"vdd" to indicate io voltage. This is in preparation for adding support
for io signal voltage switch.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>