Some networking and keys LSM hooks are conditionally enabled
and when building the new sleepable BPF LSM hooks with those
LSM hooks disabled, the following build error occurs:

  BTFIDS  vmlinux
  FAILED unresolved symbol bpf_lsm_socket_socketpair

To fix the error, conditionally add the relevant networking/keys
LSM hooks to the sleepable set.

Fixes: 423f1610 ("bpf: Augment the set of sleepable LSM hooks")
Signed-off-by: Mikko Ylinen <mikko.ylinen@linux.intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: KP Singh <kpsingh@kernel.org>
Link: https://lore.kernel.org/bpf/20210125063936.89365-1-mikko.ylinen@linux.intel.com