sepolicy: Move wifi.interfaces. label to system/sepolicy

Merged in AOSP: https://android-review.googlesource.com/2845878

Change-Id: I8f1c5f5fbc493c0d3791ece5bd8fc35fb04d4fef
diff --git a/common/private/property_contexts b/common/private/property_contexts
index 5eca95f..af7e1b4 100644
--- a/common/private/property_contexts
+++ b/common/private/property_contexts
@@ -16,6 +16,3 @@
 
 # xtra-daemon control
 persist.sys.xtra-daemon.enabled        u:object_r:xtra_control_prop:s0 exact bool
-
-# WiFi
-wifi.interface.                        u:object_r:wifi_hal_prop:s0 prefix string