regulator: dt-bindings: lltc,ltc3676: convert to YAML

Convert Linear Technology LTC3676 8-output I2C voltage regulator IC
DT bindings to DT schema. Add missing interrupts: property as this
IC does have interrupt line and it is used in existing DTs.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://patch.msgid.link/20241016225235.114635-1-marex@denx.de


Signed-off-by: Mark Brown <broonie@kernel.org>