nx: Disable screen mirroring dialog

* Our dock is closed-face, so users can't interact with this dialog.

Change-Id: I21567a85c439597a506475a4f884a75e5312356a

properties.mk

@@ -6,6 +6,10 @@ PRODUCT_PROPERTY_OVERRIDES += \
 PRODUCT_SYSTEM_PROPERTY_OVERRIDES += \
     persist.sys.NV_ECO.IF.CHARGING=false
 
+# Display Mirroring Dialog
+PRODUCT_SYSTEM_EXT_PROPERTY_OVERRIDES += \
+    persist.sysui.disable_mirroring_confirmation_dialog=true
+
 # GMS
 PRODUCT_SYSTEM_EXT_PROPERTY_OVERRIDES += \
     atv.setup.bt_remote_pairing=false