dshot: fix motor test on CANnode
Also includes fixes for the DShot driver since stop_outputs is removed. The esc info command has been removed because it doesn't work with AM32, can only be used via command line, and complicates the driver
- Updated to the latest version of the voxl2_io driver from the ModalAI fork.
- Moved to the platform independent Serial driver
- Added voxl2_io driver to the SLPI DSP build