Use MBEDTLS_OR_PSA_WANT_xxx in test_suite_rsa

The encrypt/decrypt cases don't depend on actually computing a hash,
just on information about it being available, and this information is
guarded by MBEDTLS_OR_PSA_WANT_xxx.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/tests/suites/test_suite_pkcs1_v15.function b/tests/suites/test_suite_pkcs1_v15.function
index 1fb5976..0bd3f81 100644
--- a/tests/suites/test_suite_pkcs1_v15.function
+++ b/tests/suites/test_suite_pkcs1_v15.function
@@ -1,6 +1,8 @@
 /* BEGIN_HEADER */
 #include "mbedtls/rsa.h"
 #include "mbedtls/md.h"
+
+#include "or_psa_helpers.h"
 /* END_HEADER */
 
 /* BEGIN_DEPENDENCIES