usb: typec: mux: fsa4480: add regulator support

The fsa4480 vcc lane could be driven by some external regulator.
This patch is adding support to enable the regulator before probing.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250404-ml-topic-typec-mux-fs4480-v1-1-475377ef22a3@pengutronix.de


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>