power: axp20x_usb: Add support for usb power-supply on axp22x pmics

The usb power-supply on the axp22x pmics is mostly identical to the
one on the axp20x pmics. One significant difference is that it cannot
measure / monitor the usb voltage / current.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sre@kernel.org>