bpf: use bpf_get_smp_processor_id_proto instead of raw one

Same motivation as in commit 80b48c44 ("bpf: don't use raw processor
id in generic helper"), but this time for XDP typed programs. Thus, allow
for preemption checks when we have DEBUG_PREEMPT enabled, and otherwise
use the raw variant.
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Acked-by: NAlexei Starovoitov <ast@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/filter.c

@@ -2551,6 +2551,8 @@ xdp_func_proto(enum bpf_func_id func_id)
 	switch (func_id) {
 	case BPF_FUNC_perf_event_output:
 		return &bpf_xdp_event_output_proto;
+	case BPF_FUNC_get_smp_processor_id:
+		return &bpf_get_smp_processor_id_proto;
 	default:
 		return sk_filter_func_proto(func_id);
 	}