PX4 Autopilot

An initial port of PX4 to S32K344 and MR-CANHUBK3 is available in upstream PX4:

https://github.com/PX4/PX4-Autopilot/tree/main/boards/nxp/mr-canhubk3

The target to build is:

make nxp_mr-canhubk3_fmu