feat(sgi): update rdn2edgex2's runtime config

update rdn2edgex2's run-config to search the right uart port for
expect messages.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Change-Id: Ie14401f3c040d6294a24a059e2f15e288cc46ebe
diff --git a/run_config/fvp-rdn1edgex2 b/run_config/fvp-rdn1edgex2
index bb42ef9..74f2d10 100644
--- a/run_config/fvp-rdn1edgex2
+++ b/run_config/fvp-rdn1edgex2
@@ -43,6 +43,6 @@
 	model="$model" gen_model_params
 	set_run_env "ports_script" "$ci_root/model/css-rdinfra-ports.awk"
 	set_run_env "num_uarts" "4"
-	uart="0" set_expect_variable "num_cpus" "16"
+	uart="1" set_expect_variable "num_cpus" "16"
 	model="$model" gen_fvp_yaml
 }