linux-phytec-ti

mmc: host: omap_hsmmc: Allow io voltage switch even for fixed vdd

Now that vmmc regulator is made optional, do not bail out if vmmc
regulator is not found.

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