[SF] Update DeviceProductInfo on hotplug reconnect

This change populates DeviceProductInfo on hotplug, even if we are
in legacy multi-display mode. This behaviour is guarded by sysprop
ro.surface_flinger.update_edid_on_hotplug_reconnect which is
turned off by default.

Bug: 160952291
Test: 1. connect display
      2. adb shell dumpsys SurfaceFlinger | grep deviceProductInfo
      3. connect different display
      4. adb shell dumpsys SurfaceFlinger | grep deviceProductInfo
      5. make sure DeviceProductInfo has changed.

Change-Id: I94751f678b1dd1196727ad38ab5e398fb6cf0393
diff --git a/services/surfaceflinger/sysprop/SurfaceFlingerProperties.sysprop b/services/surfaceflinger/sysprop/SurfaceFlingerProperties.sysprop
index 7666f7f..421484f 100644
--- a/services/surfaceflinger/sysprop/SurfaceFlingerProperties.sysprop
+++ b/services/surfaceflinger/sysprop/SurfaceFlingerProperties.sysprop
@@ -435,3 +435,13 @@
     access: Readonly
     prop_name: "ro.surface_flinger.display_update_imminent_timeout_ms"
 }
+
+
+# Updates the DeviceProductInfo when a hoplug reconnect event is processed
+prop {
+    api_name: "update_device_product_info_on_hotplug_reconnect"
+    type: Boolean
+    scope: Public
+    access: Readonly
+    prop_name: "ro.surface_flinger.update_device_product_info_on_hotplug_reconnect"
+}