dt-bindings: power: supply: qcom,pm8941: document usb-charge-current-limit

Document already used (in DTS and by driver) 'usb-charge-current-limit'
property:

arch/arm/boot/dts/qcom-msm8974pro-fairphone-fp2.dtb:
charger@1000: 'usb-charge-current-limit' does not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

dt-bindings: power: supply: qcom,pm8941: use regulator schema for child node

The 'usb-otg-vbus' child node is a regulator so reference the regulator
schema for proper evaluation.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

dt-bindings: power: supply: pm8941-charger: add pm8226

The charger in PM8226 (used in MSM8226) is similar to the charger in
PM8941.

Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

dt-bindings: power: supply: pm8941-charger: Convert to DT schema format

Convert the binding to DT schema format.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>