rdn2cfg2/run_model.sh: update model name

FVP_RD_N2_Multichip has been renamed to FVP_RD_N2_Cfg2 starting from
11.16/25 version. Update the warning message accordingly.
Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>
Change-Id: Ie29daa30ec7c58609c00f65c230a32bf568513d0

rdinfra/platforms/rdn2cfg2/run_model.sh

@@ -48,7 +48,7 @@ source $PWD/../../../sgi/sgi_common_util.sh
 
 # Check that the path to the model exists.
 if [ ! -f "$MODEL" ]; then
-	echo "ERROR: you should set variable MODEL to point to a valid FVP_RD_N2_Multichip" \
+	echo "ERROR: you should set variable MODEL to point to a valid FVP_RD_N2_Cfg2" \
 	     "model binary, currently it is set to \"$MODEL\""
 	exit 1
 fi