Add test builds for FEAT_MTPMU.

Signed-off-by: Javier Almansa Sobrino <javier.almansasobrino@arm.com>
Change-Id: I485d5b4b93fca92f14c8968ec818fa5049942464
diff --git a/group/tftf-l2-fvp/fvp-mtpmu-disable,fvp-default:fvp-tftf-fip.tftf-aemv8a.8_6-debug b/group/tftf-l2-fvp/fvp-mtpmu-disable,fvp-default:fvp-tftf-fip.tftf-aemv8a.8_6-debug
new file mode 100644
index 0000000..dc36574
--- /dev/null
+++ b/group/tftf-l2-fvp/fvp-mtpmu-disable,fvp-default:fvp-tftf-fip.tftf-aemv8a.8_6-debug
@@ -0,0 +1,6 @@
+#
+# Copyright (c) 2020 Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+