Add test and FVP configuration for Matterhorn

Added TFTF and Linux boot tests for Matterhorn model along with
necessary run config fragment and utilities

Signed-off-by: Bipin Ravi <bipin.ravi@arm.com>
Change-Id: I86ff1aa76fd953772a8f92e9997f373b928b98f6
diff --git a/run_config/fvp-matterhornx4 b/run_config/fvp-matterhornx4
new file mode 100644
index 0000000..1e58454
--- /dev/null
+++ b/run_config/fvp-matterhornx4
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2021 Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+post_fetch_tf_resource() {
+        local model="matterhornx4"
+
+	model="$model" \
+	cache_state_modelled="0" \
+	gen_model_params
+	uart="0" set_expect_variable "num_cpus" "4"
+	model="$model" gen_fvp_yaml
+}