RRS: Apply the default config from persist prop

vendor_config plays as another role to control the display config during
the boot time. To change the default configuration of the user selected
mode, we use persist config to store the value.

Bug: 232721840
Test: Boot w/ and w/o user selected configs and check the resolution
Change-Id: Ideed75f0a29368ff95916fb1fa87f21482c17613
diff --git a/whitechapel_pro/vendor_init.te b/whitechapel_pro/vendor_init.te
index 2b5e674..b674195 100644
--- a/whitechapel_pro/vendor_init.te
+++ b/whitechapel_pro/vendor_init.te
@@ -31,3 +31,6 @@
 
 # Battery
 set_prop(vendor_init, vendor_battery_defender_prop)
+
+# Display
+set_prop(vendor_init, vendor_display_prop)