If the voltages for buck1-4 HW states (run, idle, suspend)
are not given the driver sets hard coded defaults. Defaults
should be given as voltages but they were given as register
values. Thus the default setting at startup fails with error
prints like:

"[ 0.470421] bd718xx-pmic bd718xx-pmic.2.auto: selector for voltage [20] not found
[ 0.476194] bd718xx-pmic bd718xx-pmic.2.auto: selector for voltage [20] not found
[ 0.483772] bd718xx-pmic bd718xx-pmic.2.auto: selector for voltage [20] not found
[ 0.499269] bd718xx-pmic bd718xx-pmic.2.auto: selector for voltage [30] not found
[ 0.505202] bd718xx-pmic bd718xx-pmic.2.auto: selector for voltage [20] not found
[ 0.513683] bd718xx-pmic bd718xx-pmic.2.auto: selector for voltage [30] not found
[ 0.528991] bd718xx-pmic bd718xx-pmic.2.auto: selector for voltage [30] not found"

Correct the default values to be voltages, not the register
values.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>