For tests, rename ASSERT_COMPARE() to TEST_BUFFERS_EQUAL()

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/tests/suites/test_suite_cipher.function b/tests/suites/test_suite_cipher.function
index aa2849b..b9675fb 100644
--- a/tests/suites/test_suite_cipher.function
+++ b/tests/suites/test_suite_cipher.function
@@ -950,7 +950,7 @@
         TEST_ASSERT(buffer_is_all_zero(decrypt_buf, decrypt_buf_len));
     } else {
         TEST_ASSERT(ret == 0);
-        ASSERT_COMPARE(decrypt_buf, outlen, clear->x, clear->len);
+        TEST_BUFFERS_EQUAL(decrypt_buf, outlen, clear->x, clear->len);
     }
 
     mbedtls_free(decrypt_buf);