feat: add tests to check SCTLR2, THE and D128 sysregs

This patch adds test cases for verifying that the system registers of
FEAT_SCTLR2, FEAT_THE and FEAT_D128 (FEAT_SYSREG128) are working
correctly by performing a series of reads and writes to the registers.

Change-Id: I5c102daa358a7ec5d1801395bc875e9850e83939
Signed-off-by: Igor Podgainõi <igor.podgainoi@arm.com>
Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
diff --git a/tftf/framework/framework.mk b/tftf/framework/framework.mk
index fc0ccbd..4e27995 100644
--- a/tftf/framework/framework.mk
+++ b/tftf/framework/framework.mk
@@ -92,7 +92,8 @@
 	lib/extensions/sme/aarch64/sme_helpers.S			\
 	lib/extensions/sme/aarch64/sme2_helpers.S			\
 	lib/extensions/sve/aarch64/sve.c				\
-	lib/extensions/sve/aarch64/sve_helpers.S
+	lib/extensions/sve/aarch64/sve_helpers.S			\
+	lib/extensions/sysreg128/aarch64/sysreg128_helpers.S
 endif
 
 ifeq (${ARCH},aarch64)