arm: refactor RESET_TO_BL31 handoff config

Integration of `tlc` into the build flow has been improved to
provide greater flexibility in creating the TL binary and specifying the
dtb offset. Modify the test configuration to accommodate these changes.

Change-Id: Ib48bbdbd0317b9c537f80a11950b708aa71fe9fe
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/group/tftf-l2-fvp/fvp-aarch64-handoff-rst-bl31,fvp-aarch64-handoff:fvp-tftf.rst31-aemv8a.rst31.tftf.handoff b/group/tftf-l2-fvp/fvp-aarch64-handoff-rst-bl31,fvp-aarch64-handoff:fvp-tftf.rst31-aemv8a.rst31.tftf.handoff
index 747e74e..7dbe3ae 100644
--- a/group/tftf-l2-fvp/fvp-aarch64-handoff-rst-bl31,fvp-aarch64-handoff:fvp-tftf.rst31-aemv8a.rst31.tftf.handoff
+++ b/group/tftf-l2-fvp/fvp-aarch64-handoff-rst-bl31,fvp-aarch64-handoff:fvp-tftf.rst31-aemv8a.rst31.tftf.handoff
@@ -5,6 +5,6 @@
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
-pre_tf_build() {
-    make -C "$tf_root/tools/tlc" install
-}
+pre_tf_build(){
+    targets="bl31 tl" set_tf_build_targets
+}
\ No newline at end of file