regulator: bd718x7 initialize regulator config only once

The BD718x7 driver initialized common configs for all regulators.
Simplify initialization by moving the initialization of common configs
out of the loop.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Link: https://lore.kernel.org/r/2d3e68c94d4813410da8c4c7eac3332d167d19a8.1599029334.git.matti.vaittinen@fi.rohmeurope.com


Signed-off-by: Mark Brown <broonie@kernel.org>