regression: add tests for the supplicant plugin framework

Add test cases for checking functionality of supplicant plugins:
 - Ability to pass values and arrays to/from a plugin
 - Right handle situations with bad input parameters
 - Right handle situations with calling an unknown plugin

Signed-off-by: Aleksandr Anisimov <a.anisimov@omprussia.ru>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/host/xtest/xtest_test.c b/host/xtest/xtest_test.c
index d13e96d..b812057 100644
--- a/host/xtest/xtest_test.c
+++ b/host/xtest/xtest_test.c
@@ -20,6 +20,7 @@
 #include <ta_storage_benchmark.h>
 #include <ta_socket.h>
 #include <ta_tpm_log_test.h>
+#include <ta_supp_plugin.h>
 #include <tee_api_defines.h>
 #include <__tee_isocket_defines.h>
 #include <__tee_tcpsocket_defines.h>
@@ -196,3 +197,4 @@
 const TEEC_UUID socket_ta_uuid = TA_SOCKET_UUID;
 const TEEC_UUID sdp_basic_ta_uuid = TA_SDP_BASIC_UUID;
 const TEEC_UUID tpm_log_test_ta_uuid = TA_TPM_LOG_TEST_UUID;
+const TEEC_UUID supp_plugin_test_ta_uuid = TA_SUPP_PLUGIN_UUID;