sepolicy: Adding rules for servicetracker HAL for legacy target.

Also adding file_context for servicetracker V1.2
Change-Id: I7145f86093c954376e6dd8bbcd8f6d2e6005a981
diff --git a/legacy/vendor/common/system_server.te b/legacy/vendor/common/system_server.te
index 433168a..5aedca4 100644
--- a/legacy/vendor/common/system_server.te
+++ b/legacy/vendor/common/system_server.te
@@ -55,6 +55,8 @@
 unix_socket_send(system_server, iop, dumpstate)
 unix_socket_connect(system_server, iop, dumpstate)
 
+hal_client_domain(system_server, hal_srvctracker)
+
 # allow  system/framework applications to update the dpmd configuration files
 #unix_socket_connect(system_server, dpmd, dpmd);
 #allow system_server { dpmd_socket socket_device }:sock_file w_file_perms;