usb: phy: generic: add suspend support for regulator

Disable the vcc regulator on suspend and enable it on resume.

Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20231027122955.22123-1-francesco@dolcini.it


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