Add Benchmark Test Suite

For now we only have one test suite in xtest.
This patch provides another test suite for benchmark,
but the benchmark test cases are not implemented yet.

User can still run original xtest test suite with the
same command as before.

The command to run benchmark tests as follows:

	xtest -t benchmark <test id>

Tested-by: James Kung <james.kung@linaro.org> (QEMU)
Tested-by: Pascal Brand <pascal.brand@linaro.org> (QEMU)
Signed-off-by: James Kung <james.kung@linaro.org>
Reviewed-by: Pascal Brand <pascal.brand@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/host/xtest/xtest_test.h b/host/xtest/xtest_test.h
index 12623e9..d07f451 100644
--- a/host/xtest/xtest_test.h
+++ b/host/xtest/xtest_test.h
@@ -201,6 +201,7 @@
 extern const TEEC_UUID ecc_test_ta_uuid;
 extern const TEEC_UUID gp_tta_time_uuid;
 extern const TEEC_UUID concurrent_ta_uuid;
+extern const TEEC_UUID bonnie_ta_uuid;
 extern char *_device;
 
 #endif /*XTEST_TEST_H*/