feat(trf): add trace filter control registers access test

Added a test to read trace filter control registers to ensure that EL3
is giving permission to non-secure EL2 to access these registers.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I9354d8592bd187206add717b9d3b0206382a06d3
diff --git a/tftf/tests/tests-cpu-extensions.mk b/tftf/tests/tests-cpu-extensions.mk
index a4e5d11..e5f4f79 100644
--- a/tftf/tests/tests-cpu-extensions.mk
+++ b/tftf/tests/tests-cpu-extensions.mk
@@ -13,6 +13,7 @@
 	extensions/sve/sve_operations.S					\
 	extensions/sve/test_sve.c					\
 	extensions/trbe/test_trbe.c					\
+	extensions/trf/test_trf.c					\
 	runtime_services/arm_arch_svc/smccc_arch_soc_id.c		\
 	runtime_services/arm_arch_svc/smccc_arch_workaround_1.c		\
 	runtime_services/arm_arch_svc/smccc_arch_workaround_2.c		\