When the regulator API was merged it was added to the separate Kconfig
which ARM uses for drivers but not the generic one in drivers/.  Since
there is nothing ARM-specific about the API add it there too.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NLiam Girdwood <lrg@slimlogic.co.uk>