Revert BPF token-related functionality

This patch includes the following revert (one  conflicting BPF FS
patch and three token patch sets, represented by merge commits):
  - revert 0f5d5454 "Merge branch 'bpf-fs-mount-options-parsing-follow-ups'";
  - revert 750e7857 "bpf: Support uid and gid when mounting bpffs";
  - revert 73376328 "Merge branch 'bpf-token-support-in-libbpf-s-bpf-object'";
  - revert c35919dc "Merge branch 'bpf-token-and-bpf-fs-based-delegation'".

Link: https://lore.kernel.org/bpf/CAHk-=wg7JuFYwGy=GOMbRCtOL+jwSQsdUaBsRWkDVYbxipbM5A@mail.gmail.com


Signed-off-by: Andrii Nakryiko <andrii@kernel.org>