usb: phy: phy-gpio-vbus-usb: Add device tree probing

usb: phy: phy-gpio-vbus-usb: Add device tree probing

Make it possible to probe the GPIO VBUS detection driver
from the device tree compatible for GPIO USB B connectors.

Since this driver is using the "gpio-usb-b-connector"
compatible, it is important to discern it from the role
switch connector driver (which does not provide a phy),
so we add some Kconfig text and depend on !USB_CONN_GPIO.

Cc: Rob Herring <robh@kernel.org>
Cc: Prashant Malani <pmalani@chromium.org>
Cc: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20221106230506.1646101-1-linus.walleij@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>