Move tests for error.c from tf-psa-crypto to Mbed TLS

This commit moves the test functions and test data from tf-psa-crypto to
Mbed TLS.

Signed-off-by: Harry Ramsey <harry.ramsey@arm.com>

tests/suites/test_suite_error.function

@@ -0,0 +1,21 @@
+/* BEGIN_HEADER */
+#include "mbedtls/error_common.h"
+/* END_HEADER */
+
+/* BEGIN_DEPENDENCIES
+ * depends_on:MBEDTLS_ERRORCOMMON_C
+ * END_DEPENDENCIES
+ */
+
+/* BEGIN_CASE */
+void error_strerror(int code, char *result_str)
+{
+    char buf[500];
+
+    memset(buf, 0, sizeof(buf));
+
+    mbedtls_strerror(code, buf, 500);
+
+    TEST_ASSERT(strcmp(buf, result_str) == 0);
+}
+/* END_CASE */