tools/bpf: fix core_reloc.c compilation error

On my local machine, I have the following compilation errors:
=====
  In file included from prog_tests/core_reloc.c:3:0:
  ./progs/core_reloc_types.h:517:46: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fancy_char_ptr_t’
 typedef const char * const volatile restrict fancy_char_ptr_t;
                                              ^
  ./progs/core_reloc_types.h:527:2: error: unknown type name ‘fancy_char_ptr_t’
    fancy_char_ptr_t d;
    ^
=====

I am using gcc 4.8.5. Later compilers may change their behavior not emitting the
error. Nevertheless, let us fix the issue. "restrict" can be tested
without typedef.

Fixes: 9654e2a ("selftests/bpf: add CO-RE relocs modifiers/typedef tests")
Cc: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/progs/core_reloc_types.h

@@ -514,7 +514,7 @@ typedef arr1_t arr2_t;
 typedef arr2_t arr3_t;
 typedef arr3_t arr4_t;
 
-typedef const char * const volatile restrict fancy_char_ptr_t;
+typedef const char * const volatile fancy_char_ptr_t;
 
 typedef core_reloc_mods_substruct_t core_reloc_mods_substruct_tt;