Allow libbpf-tools to run on old kernels

We have a bunch of libbpf tools require features like `fentry` / `tp_btf` which only available on kernel v5.5+.
Running these tools on old kernels result in EINVAL. Instead of error out, we can fallback to kprobe.
Open this ticket to keep track of this process:

* [x] biolatency
* [ ] biosnoop
* [ ] biostacks
* [ ] bitesize
* [ ] cachestat
* [ ] cpudist
* [ ] cpufreq
* [x] drsnoop
* [x] hardirqs
* [x] mdflush
* [x] numamove
* [ ] offcputime
* [ ] readahead
* [x] softirqs

If you are interested, please feel free to pick it up.