Fix unnecessary header prefixes in tests

Remove unnecessary "../library" prefix from test suite includes. This
makes the tests repo-agnostic between the mbedtls and psa-crypto repos.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
diff --git a/tests/suites/test_suite_common.function b/tests/suites/test_suite_common.function
index a583e46..5c5700c 100644
--- a/tests/suites/test_suite_common.function
+++ b/tests/suites/test_suite_common.function
@@ -1,5 +1,5 @@
 /* BEGIN_HEADER */
-#include "../library/common.h"
+#include "common.h"
 
 void fill_arrays(unsigned char *a, unsigned char *b, unsigned char *r1, unsigned char *r2, size_t n)
 {