regulator: Kconfig: Mention that PFUZE3000 is also supported

The CONFIG_REGULATOR_PFUZE100 option also supports PFUZE3000, so
mention that in the Kconfig text.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>