bpf, btf: Remove the duplicate btf_ids.h include

Remove duplicate btf_ids.h header which is included twice.
Signed-off-by: Wang Qing <wangqing@vivo.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/1604736650-11197-1-git-send-email-wangqing@vivo.com

kernel/bpf/btf.c

@@ -22,7 +22,6 @@
 #include <linux/skmsg.h>
 #include <linux/perf_event.h>
 #include <linux/bsearch.h>
-#include <linux/btf_ids.h>
 #include <net/sock.h>
 
 /* BTF (BPF Type Format) is the meta data format which describes