samples/bpf: Remove duplicate include in hbm

The 'bpf/bpf.h' include in 'samples/bpf/hbm.c' is duplicated.
Signed-off-by: Menglong Dong <dong.menglong@zte.com.cn>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/1604654034-52821-1-git-send-email-dong.menglong@zte.com.cn

samples/bpf/hbm.c

@@ -51,7 +51,6 @@
 #include "cgroup_helpers.h"
 #include "hbm.h"
 #include "bpf_util.h"
-#include <bpf/bpf.h>
 #include <bpf/libbpf.h>
 
 bool outFlag = true;