selftests/bpf: Sort config in alphabetic order

Move CONFIG_VSOCKETS up, so the CONFIGs are in alphabetic order.

Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20231129234417.856536-5-song@kernel.org


Signed-off-by: Alexei Starovoitov <ast@kernel.org>