Merge branch 'Do not limit cb_flags when creating child sk'

Martin KaFai says:

====================
This set fixes an issue that the bpf_skops_init_child() unnecessarily
limited the child sk from inheriting all bpf_sock_ops_cb_flags
of the listen sk.  It also adds a test to check that.
====================

Tested-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>