test/bpf: use hton for endianness

test/bpf: use hton for endianness

Convert host machine endianness to networking endianness for
comparison of incoming packets with BPF filter

Suggested-by: Brian Brooks <brian.brooks@arm.com>
Signed-off-by: Malvika Gupta <malvika.gupta@arm.com>
Reviewed-by: Gavin Hu <gavin.hu@arm.com>
Acked-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>