perf machine: Remove needless map_type from machine__load_vmlinux_path()

Since it uses machine__kernel_map() and this function always returns the
MAP__FUNCTION map, it doesn't make sense to call it with MAP__VARIABLE.

And also this is a step in the direction of nuking the MAP__{FUNCTION,VARIABLE}
split.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-0h3eof3kx3kq32ixg5fquf3p@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/vmlinux-kallsyms.c

@@ -94,7 +94,7 @@ int test__vmlinux_matches_kallsyms(struct test *test __maybe_unused, int subtest
 	 * maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines
 	 * to fixup the symbols.
 	 */
-	if (machine__load_vmlinux_path(&vmlinux, type) <= 0) {
+	if (machine__load_vmlinux_path(&vmlinux) <= 0) {
 		pr_debug("Couldn't find a vmlinux that matches the kernel running on this machine, skipping test\n");
 		err = TEST_SKIP;
 		goto out;