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/tests/tests-cpu-extensions.mk b/tftf/tests/tests-cpu-extensions.mk
index a6d6e2a..39783b1 100644
--- a/tftf/tests/tests-cpu-extensions.mk
+++ b/tftf/tests/tests-cpu-extensions.mk
@@ -8,6 +8,7 @@
 	extensions/afp/test_afp.c					\
 	extensions/amu/test_amu.c					\
 	extensions/brbe/test_brbe.c					\
+	extensions/d128/test_d128.c					\
 	extensions/debugv8p9/test_debugv8p9.c				\
 	extensions/ecv/test_ecv.c					\
 	extensions/fgt/test_fgt.c					\
@@ -18,11 +19,13 @@
 	extensions/mte/test_mte.c					\
 	extensions/pauth/test_pauth.c					\
 	extensions/pmuv3/test_pmuv3.c					\
+	extensions/sctlr2/test_sctlr2.c					\
 	extensions/sme/test_sme.c					\
 	extensions/sme/test_sme2.c					\
 	extensions/spe/test_spe.c					\
 	extensions/sve/test_sve.c					\
 	extensions/sys_reg_trace/test_sys_reg_trace.c			\
+	extensions/the/test_the.c					\
 	extensions/trbe/test_trbe.c					\
 	extensions/trf/test_trf.c					\
 	extensions/wfxt/test_wfxt.c					\