bpf: resync uapi header
bpf: resync uapi header

Small resync of the uapi header which fixes up bpf_ prefixed helper
description before it got frozen by the final release [0] and a number
of new extensions and helpers.

  [0] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b7906b70a2337e445b8dca3ce7ba8976b6ebd07d

Signed-off-by: Daniel Borkmann <3d0f3b9ddcacec30c4008c5e030e6c13a478cb4f@iogearbox.net>

michi-covalent/cilium,tgraf/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,tklauser/cilium,tklauser/cilium,tgraf/cilium,tgraf/cilium,tgraf/cilium,tklauser/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium