Fix component-test/arm-linux linking issue

The mentioned deployment fails to link due to missing CppUTest specific
symbols. This patch fixes the issue by linking libCppUTestExt.a.

Signed-off-by: Gyorgy Szing <Gyorgy.Szing@arm.com>
Change-Id: I046c569004ae8cd499ee37dfba9e1cb64a12caba
diff --git a/deployments/component-test/arm-linux/CMakeLists.txt b/deployments/component-test/arm-linux/CMakeLists.txt
index be36900..b30b160 100644
--- a/deployments/component-test/arm-linux/CMakeLists.txt
+++ b/deployments/component-test/arm-linux/CMakeLists.txt
@@ -26,7 +26,7 @@
 )
 
 include(${TS_ROOT}/external/CppUTest/CppUTest.cmake)
-target_link_libraries(component-test PRIVATE CppUTest)
+target_link_libraries(component-test PRIVATE ${CppUTest_LIBRARIES})
 
 #-------------------------------------------------------------------------------
 #  Components that are specific to deployment in the arm-linux environment.