Populate FVP YAML files for cortex-a78x4 models

FVP YAML file generation is a two step process: 1. yaml template
creation and 2. fvp values replacement on template created by 1. This
patch only relates to 2 and specifically for 'cortex-a78x4' models.

Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
Change-Id: I6957371df0043c363c5e7f3c592a4525c5c007b2
diff --git a/run_config/fvp-cortexa78x4 b/run_config/fvp-cortexa78x4
index bc636ca..b59b60d 100644
--- a/run_config/fvp-cortexa78x4
+++ b/run_config/fvp-cortexa78x4
@@ -5,4 +5,8 @@
 	cache_state_modelled="0" \
 	gen_model_params
 	uart="0" set_expect_variable "num_cpus" "4"
+
+	model="cortex-a78x4" \
+	model_bin="FVP_Base_Cortex-A78x4" \
+	       gen_fvp_yaml
 }