bpf: Fix test_obj_id.c for llvm 5.0

llvm 5.0 does not like the section name and the function name
to be the same:

clang -I. -I./include/uapi -I../../../include/uapi \
	-I../../../../samples/bpf/ \
	-Wno-compare-distinct-pointer-types \
	-O2 -target bpf -c \
	linux/tools/testing/selftests/bpf/test_obj_id.c -o \
	linux/tools/testing/selftests/bpf/test_obj_id.o
fatal error: error in backend: 'test_prog_id' label emitted multiple times to
assembly file
clang-5.0: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
clang version 5.0.0 (trunk 304326) (llvm/trunk 304329)

This patch makes changes to the section name and the function name.

Fixes: 95b9afd3 ("bpf: Test for bpf ID")
Reported-by: NAlexei Starovoitov <ast@fb.com>
Reported-by: NYonghong Song <yhs@fb.com>
Signed-off-by: NMartin KaFai Lau <kafai@fb.com>
Acked-by: NDaniel Borkmann <daniel@iogearbox.net>
Acked-by: NYonghong Song <yhs@fb.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

tools/testing/selftests/bpf/test_obj_id.c

@@ -23,8 +23,8 @@ struct bpf_map_def SEC("maps") test_map_id = {
 	.max_entries = 1,
 };
 
-SEC("test_prog_id")
-int test_prog_id(struct __sk_buff *skb)
+SEC("test_obj_id_dummy")
+int test_obj_id(struct __sk_buff *skb)
 {
 	__u32 key = 0;
 	__u64 *value;