mmc: host: omap_hsmmc: return error if any of the regulator APIs fail
mmc: host: omap_hsmmc: return error if any of the regulator APIs fail

Return error if any of the regulator APIs (regulator_enable,
regulator_disable, regulator_set_voltage) fails in
omap_hsmmc_set_power to avoid undefined behavior.

Signed-off-by: Kishon Vijay Abraham I <c224db9378a929ae8338a052bbb1b30fb46cdd39@ti.com>
Tested-by: Tony Lindgren <1001e8702733cced254345e193c88aaa47a4f5de@atomide.com>
Signed-off-by: Ulf Hansson <fe47b31f388f85ce6ddf64bf3a0cf6b46077d0e6@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs