drop ieee1394 support

bit of an oddball kcm at this point

- firewire has largely been abandoned in favor of usb3/thunderbolt
- there is no actually maintained cli tooling for it so it can't become
a cli module, which is a bit meh cause CLI is the future ™️
- it's unclear if this still works because there appears to be no way to
synthesize a device on the kernel level or a VM level so unless someone
has a port and suitable device this entire kcm is effectively untestable