Hisilicon hi655x Power Management Integrated Circuit (PMIC)

Required properties:
- compatible: Should be "hisilicon,hi655x-pmic"
- reg: Base address of PMIC on hi6220 soc
- interrupt-controller: Hi655x has internal IRQs (has own IRQ domain).
- pmic-gpios: The gpio used by pmic irq.

Example:
        pmic: pmic@f8000000 {
                compatible = "hisilicon,hi655x-pmic";
                reg = <0x0 0xf8000000 0x0 0x1000>;
                #interrupt-cells = <2>;
                interrupt-controller;
                pmic-gpios = <&gpio_pmu_irq_n>;
                status = "okay";
        }
