linux-yocto/5.15: bpf: explicitly disable unpriv eBPF by default

Integrating the following commit(s) to linux-yocto/.:

    5371fc3b2a2 bpf: explicitly disable unpriv eBPF by default

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 3da9b788)
Signed-off-by: Steve Sakoman <steve@sakoman.com>