regulator: dt-bindings: Add TI TPS65219 PMIC bindings

Add TPS65219 PMIC bindings using json-schema.

Describe required properties and regname-supply.
regname-supply is required when bypass mode is used for a regulator.
Describes regulator topology.
Interrupts support.
Add a power-button property to configure the EN/PB/VSENSE pin as a
powerbutton:

TPS65219 has a multipurpose pin called EN/PB/VSENSE that can be either:
- EN in which case it functions as an enable pin.
- VSENSE which compares the voltages and triggers an automatic
on/off request.
- PB in which case it can be configured to trigger an interrupt
to the SoC.
ti,power-button reflects the last one of those options
where the board has a button wired to the pin and triggers
an interrupt on pressing it.

Signed-off-by: Markus Schneider-Pargmann <[email protected]>
Signed-off-by: Jerome Neanne <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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