Add support for the AXP192. It is most similar to the AXP202 but
the current limits are different and the USB OTG status register
has a different address (0x04 instead of 0x02).
Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>