Dynamic ldousb input selection based on input voltage

Required Properties:
- compatible: Must be "ti,palmas-ldousb-in"
- ti,ldousb-in-threshold-voltage: Threshold voltage on input to change
               inputs i.e. IN1 or IN2.
- ti,enable-in1-above-threshold: Boolean type. Enable IN1 above threshold.
               If this property is not available then enable IN2 on aboe
               threshold.
- ti,threshold-voltage-tolerance: Switch to above threshold input if the input
               voltage is beyond threshold + tolerance.
- ldousb-in1-supply: IN1 regualtor supply.
- ldousb-in2-supply: IN2 regulator supply.

Example:
palmas_ldousb_in {
	compatible = "ti,palmas-ldousb-in";
	ti,ldousb-in-threshold-voltage = <3500>;
	ti,threshold-voltage-tolerance = <200>;
	ti,enable-in1-above-threshold;
	ldousb-in1-supply = <&palmas_smps10_out2>;
	ldousb_in2-supply = <&vdd_ac_bat_reg>;
};

