dt-bindings: mfd: Add samsung,s2mpg11-pmic

The Samsung S2MPG11 PMIC is similar to the existing S2MPG10 PMIC
supported by this binding, but still differs enough from it to justify
a separate binding.

It is a Power Management IC for mobile applications with buck
converters, various LDOs, power meters, NTC thermistor inputs, and
additional GPIO interfaces and typically complements an S2MPG10 PMIC in
a main/sub configuration as the sub-PMIC.

Like S2MPG10, communication is via the Samsung ACPM firmware and it
therefore needs to be a child of the ACPM firmware node.

Add the PMIC, the regulators node, and the supply inputs of the
regulator rails, with the supply names matching the datasheet.

Note: S2MPG11 is typically used as the sub-PMIC together with an
S2MPG10 PMIC in a main/sub configuration, hence the datasheet and the
binding both suffix the supplies with an 's'.

Signed-off-by: André Draszik <andre.draszik@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20260122-s2mpg1x-regulators-v7-6-3b1f9831fffd@linaro.org
Signed-off-by: Lee Jones <lee@kernel.org>

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