Silicon Labs FM radio device

-FM RX playback with RDS
	FM signal is demodulated then audio L/R samples are sent to external audio codec.
	FM Rx RDS data received sent to host processor on I2C.

Required Properties:
- compatible: "silabs,silabs-fm"

Example:
	silabs,silabs-fm {
		compatible = "silabs,silabs-fm";
	};