feat(ls64): add a test for 64byte loads/stores instructions

This patch adds a test to verify the 64 byte load and store
instructions introduced by FEAT_LS64.
The test primarily executes instructions:
1. LD64B
2. ST64B
and ensures that the NS-EL2 has no dependency on EL3 while
running them.

Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
Change-Id: I7a4ca0ee4a2c18bf0de030c72e35eb218bc6364c
diff --git a/tftf/tests/tests-cpu-extensions.mk b/tftf/tests/tests-cpu-extensions.mk
index 51f2e55..144694e 100644
--- a/tftf/tests/tests-cpu-extensions.mk
+++ b/tftf/tests/tests-cpu-extensions.mk
@@ -11,10 +11,12 @@
 	extensions/debugv8p9/test_debugv8p9.c				\
 	extensions/ecv/test_ecv.c					\
 	extensions/fgt/test_fgt.c					\
-	extensions/pmuv3/test_pmuv3.c					\
+	extensions/ls64/test_ls64.c 					\
+	extensions/ls64/ls64_operations.S				\
 	extensions/mpam/test_mpam.c					\
 	extensions/mte/test_mte.c					\
 	extensions/pauth/test_pauth.c					\
+	extensions/pmuv3/test_pmuv3.c					\
 	extensions/sme/test_sme.c					\
 	extensions/sme/test_sme2.c					\
 	extensions/spe/test_spe.c					\