bpf: fix doxygen comment

Fix typo in doxygen comments for rte_bpf_convert().

Fixes: 2eccf6afbea9 ("bpf: add function to convert classic BPF to DPDK BPF")

Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

lib/bpf/rte_bpf.h

@@ -221,8 +221,6 @@ struct bpf_program;
  *
  * @param prog
  *  Classic BPF program from pcap_compile().
- * @param prm
- *  Result Extended BPF program.
  * @return
  *   Pointer to BPF program (allocated with *rte_malloc*)
  *   that is used in future BPF operations,