Add temporary policy for wpa_supplicant.

This allows wpa_supplicant to interact with the sockets created
for it by init. Eventually we'll want those to be properly
labelled, but allow until then.

Change-Id: I33fcd22173a8d47bbc4ada8d6aa62b4d159cbb15

wpa_supplicant.te

@@ -19,6 +19,5 @@ allow wpa random_device:chr_file r_file_perms;
 type_transition wpa wifi_data_file:sock_file wpa_socket;
 allow wpa wpa_socket:sock_file create_file_perms;
 
-# Allow init to create wpa_socket and transition to wpa
-type_transition init wpa_socket:unix_dgram_socket wpa_socket;
-allow wpa wpa_socket:unix_dgram_socket { read write };
+# Allow wpa to read and write unix dgram sockets from init
+allow wpa init:unix_dgram_socket { read write };