Remove debug module from `devicetree`

Created by: huettern

This changes two things in the devicetree:

1. Remove the debug-module. It causes an hwirq 0xffff is too large kernel panic in the mainline kernel (fault occurred with v5.14.0)
2. Change the compatible string of the uart to one that activates the FiFo. Tested with linux-v5.16.0 in the occamy system (see 8250_port.c in kernel sources)