Update wpa_supplicant policy

Change-Id: I9b05f0f2ce6c6c52b4207cac3120f06565b7da30

wpa_supplicant.te

@@ -18,3 +18,7 @@ allow wpa random_device:chr_file r_file_perms;
 # Create a socket for receiving info from wpa
 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 };