asm: update eBPF built-in functions

[florianl]

Sync eBPF built-in functions with Linux kernel v6.2.

The format of ___BPF_FUNC_MAPPER in include/uapi/linux/bpf.h change slightly and I used a modified version of the gawk script from the comment, to generate the output:

/FN\(.+)/ {
  match($1, /\(([a-z_0-9]+),/, r)
  split(r[1], p, "_")
  printf "Fn"
  for (i in p) {
    printf "%s%s", toupper(substr(p[i], 1, 1)), substr(p[i], 2)
  }
  print ""
}

[lmb]

Should we update the scriptlet in the doc comment as well?

[florianl]

updated the PR to include the changes to extract the data.