add xenomai

hc

2024-11-01 2f529f9b558ca1c1bd74be7437a84e4711743404

/home/data/hc/rk3588_linux/kernel/xenomai-v3.2.4/kernel/drivers/serial/16550A_io.h does not exist in tree b03afb3a48717f0fdb0d2b113ff2aa0ff8cb530f