usb: phy: generic: Add wakeup capability

In case USB phy is the wakeup source, enable its wakeup
capability.

Signed-off-by: Li Jun <jun.li@nxp.com>
Link: https://lore.kernel.org/r/1666764742-4201-2-git-send-email-jun.li@nxp.com


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