Add sysprop for updating device product info

Test: read the prop from SurfaceFlinger; test on device
Change-Id: I4cde2244a9991e7051b3a3d52882ed4430ed046f
diff --git a/private/property_contexts b/private/property_contexts
index 4f7a1dc..ae85610 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -842,6 +842,7 @@
 ro.surface_flinger.use_content_detection_for_refresh_rate u:object_r:surfaceflinger_prop:s0 exact bool
 ro.surface_flinger.color_space_agnostic_dataspace         u:object_r:surfaceflinger_prop:s0 exact int
 ro.surface_flinger.refresh_rate_switching                 u:object_r:surfaceflinger_prop:s0 exact bool
+ro.surface_flinger.update_edid_on_hotplug_reconnect       u:object_r:surfaceflinger_prop:s0 exact bool
 
 ro.sf.disable_triple_buffer u:object_r:surfaceflinger_prop:s0 exact bool
 ro.sf.lcd_density           u:object_r:surfaceflinger_prop:s0 exact int