Add CRSF and telemetry support

[PetervdPerk-NXP]

Basic CRSF support and telemetry

Todo:

• Make telemetry update dynamic based on transmitter config (we can parse this from link statistics)
• Implement GNSS telemetry
  - Implement attitude telemetry
• Log link status to zros somehow.

You config needs to add the following for CRC and DMA

CONFIG_CRC=y
CONFIG_UART_ASYNC_API=y

dts example change compatible to crsf

&lpuart8 {
	status = "okay";
	pinctrl-0 = <&pinmux_lpuart8>;
	pinctrl-1 = <&pinmux_lpuart8_sleep>;
	pinctrl-names = "default", "sleep";
	current-speed = <420000>;

	sbus0: sbus {
		compatible = "tbs,crsf";

[bperseghetti]

@PetervdPerk-NXP mentioned to look out for any CRC errors.