Merge branch 'pr/bpf-sysctl' into bpf-next

Pull the migration of the BPF sysctl handling into BPF core. This work is
needed in both sysctl-next and bpf-next tree.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/bpf/b615bd44-6bd1-a958-7e3f-dd2ff58931a1@iogearbox.net