dt-bindings: pfuze100.yaml: Add an entry for interrupts

dt-bindings: pfuze100.yaml: Add an entry for interrupts

The PFUZE100 PMIC has an interrupt pin that can be connected to
the host SoC. Describe it in the dt-bindings to avoid warnings like:

imx6q-zii-rdu2.dtb: pmic@8: 'interrupt-parent', 'interrupts' do not match any of the regexes: 'pinctrl-[0-9]+'
From schema: Documentation/devicetree/bindings/regulator/pfuze100.yaml

Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230527205048.418360-1-festevam@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>