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/Makefile b/host/xtest/Makefile
index 3ca8a28..297cd12 100644
--- a/host/xtest/Makefile
+++ b/host/xtest/Makefile
@@ -104,6 +104,7 @@
 
 CFLAGS += -I./
 CFLAGS += -I./adbg/include
+CFLAGS += -I../supp_plugin/include
 CFLAGS += -I$(out-dir)/xtest
 
 CFLAGS += -I$(OPTEE_CLIENT_EXPORT)/include
@@ -126,6 +127,7 @@
 CFLAGS += -I../../ta/socket/include
 CFLAGS += -I../../ta/sdp_basic/include
 CFLAGS += -I../../ta/tpm_log_test/include
+CFLAGS += -I../../ta/supp_plugin/include
 
 TA_DIR ?= /lib/optee_armtz
 CFLAGS += -DTA_DIR=\"$(TA_DIR)\"