rockchip-charger-manager bindings
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Required properties :
 - compatible : "rockchip-charger-manager"
 - cm-chargers : name of charger
 - cm-fuel-gauge : name of battery fuel gauge
 - cm-charge-pump : name of battery charge pump

Optional properties :
 - cm-poll-mode : polling mode - 0 for disabled, 1 for always, 2 for when
	external power is connected, or 3 for when charging.  If not present,
	then polling is disabled
 - cm-poll-interval : polling interval (in ms)

Example :
	charger-manager {
		compatible = "rockchip-charger-manager";
		cm-poll-mode = <2>;
		cm-poll-interval = <5000>;

		cm-chargers = "sgm4154x-charger";
		cm-charge-pump = "sc8551-standalone";
		cm-chargers-phandle = <&usbc0>;
		cm-fuel-gauge = "test_battery";
		monitored-battery = <&bat>;
		extcon = <&u2phy0>;
	};