regulator: fix a kernel-doc markup

It seems that the function was renamed. kernel-doc markup
should follow it.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/dffad16d4d6427d7d0fc89797e4126fe7c69d5de.1603469755.git.mchehab+huawei@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>