bpf: add support for new fields in struct bpf_prog_info

bpf: add support for new fields in struct bpf_prog_info

* bpf_attr.h (struct bpf_prog_info_struct): Add run_time_ns and run_cnt
fields.
* bpf.c (print_bpf_prog_info): Decode run_time_ns and run_cnt fields
introduced by Linux kernel commit v5.1-rc1~178^2~17^2~15^2~2.
* NEWS: Mention it.
* tests/bpf-obj_get_info_by_fd.c (main): Update expected output.