selftests: Add test plan API to kselftest.h and adjust callers

The test plan for TAP needs to be declared immediately after the header.
This adds the test plan API to kselftest.h and updates all callers to
declare their expected test counts.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/membarrier/membarrier_test.c

@@ -304,6 +304,7 @@ static int test_membarrier_query(void)
 int main(int argc, char **argv)
 {
 	ksft_print_header();
+	ksft_set_plan(13);
 
 	test_membarrier_query();
 	test_membarrier();