Merge branch 'Split bpf_sk_lookup remote_port field'

Jakub Sitnicki says:

====================

Following the recent split-up of the bpf_sock dst_port field, apply the same to
technique to the bpf_sk_lookup remote_port field to make uAPI more user
friendly.

v1 -> v2:
- Remove remote_port range check and cast to be16 in TEST_RUN for sk_lookup
  (kernel test robot)
====================

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