* RT5509 SPK AMP controller

Required Specific Properties:

- compatible : "richtek,rt5509"

Optional Specific Properties:

- proprietary_param : proprietary param for Richtek RT5509,
		      something liks as the speaker protection/MBDRC/ALC, etc...

Example:

	i2c@12C70000 {
		status = "ok";
		rt5509: rt5509@34 {
			status = "ok";
			compatible = "richtek,rt5509";
			reg = <0x34>;
		};
	};
