Samsung DC vibrator

Required properties:

 - compatible: must be "samsung,dc_vibrator".

 - dc_vib,motor_type: must be "COINDC".

Optional properties:

 - dc_vib,gpio_en: GPIO used for enable motor.

 - dc_vib,regulator_name: Regulator name used for enable motor.

 - dc_vib,use_qc_regulator: If DC vibraotr VCC is connected with special QCOM
   pmic ldo, use this property.

 - pinctrl variants.

Examples:

 dc_vibrator {
	 compatible = "samsung,dc_vibrator";
	 status = "okay";
	 dc_vib,gpio_en = <&gpio 1 0>;
	 dc_vib,regulator_name = "VDD_LDO";
	 dc_vib,use_qc_regulator;
	 dc_vib,motor_type = "COINDC";
 };