Add test_runner service

This is a new service with client and provider that can be
used for running tests in a secure processing environment
and retrieving the results.  The test_runner provider allows
for arbitrary test farmework backends.  The goal is to
have a cpputest backend.  In this commit, a mock backend
is included for testing the service itself.  The service
has its own access protocol defined under the protocols
top-level directory.

Signed-off-by: Julian Hall <julian.hall@arm.com>
Change-Id: If4e965c110763bd805abbdcb87e7e03cd76248b2
diff --git a/components/service/test_runner/provider/component.cmake b/components/service/test_runner/provider/component.cmake
new file mode 100644
index 0000000..4a37648
--- /dev/null
+++ b/components/service/test_runner/provider/component.cmake
@@ -0,0 +1,13 @@
+#-------------------------------------------------------------------------------
+# Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#-------------------------------------------------------------------------------
+if (NOT DEFINED TGT)
+	message(FATAL_ERROR "mandatory parameter TGT is not defined.")
+endif()
+
+target_sources(${TGT} PRIVATE
+	"${CMAKE_CURRENT_LIST_DIR}/test_runner_provider.c"
+	)