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/fvp_utils.sh b/fvp_utils.sh
index aa637de..25bf8b3 100644
--- a/fvp_utils.sh
+++ b/fvp_utils.sh
@@ -84,6 +84,7 @@
 [neoverse_n1]="${fvp_arm_std_library};FVP_Base_Neoverse-N1x1"
 [neoverse_n2]=";;;"
 [neoverse-v1x4]=";;;"
+[matterhornx4]=";;;"
 [css-rdv1]=";;;"
 [css-rde1edge]=";;;"
 [css-rdn1edge]=";;;"