Adds support for device tree to setup a max8903 battery charger. DC and USB
validity are determined by looking the presence of the dok and uok gpios.
Signed-off-by: NChris Lapa <chris@lapa.com.au>
Reviewed-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NSebastian Reichel <sre@kernel.org>