sm8450-common: Cleanup wfd properties

Change-Id: Idbcd6fa9d306ffde7c23709e6c43b50baa7081cb

properties/system.prop

@@ -22,7 +22,6 @@ persist.vendor.sensors.enable.mag_filter=true
 
 # WiFi display
 persist.debug.wfd.enable=1
-persist.sys.wfd.virtual=0
 
 # WLAN
 ro.hardware.wlan.chip=qca6490