Making sure audioserver can write into foreground cpuset

If multiple writepids, all must be in one line to take effect.
Else, only the last one will take effect.

bug: 30192722
bug: 28312446

Change-Id: I3dcb047ef724c79994443da8a9be10b196301445
diff --git a/media/audioserver/audioserver.rc b/media/audioserver/audioserver.rc
index fef430b..80f78b6 100644
--- a/media/audioserver/audioserver.rc
+++ b/media/audioserver/audioserver.rc
@@ -4,5 +4,4 @@
     # media gid needed for /dev/fm (radio) and for /data/misc/media (tee)
     group audio camera drmrpc inet media mediadrm net_bt net_bt_admin net_bw_acct
     ioprio rt 4
-    writepid /dev/cpuset/foreground/tasks
-    writepid /dev/stune/foreground/tasks
\ No newline at end of file
+    writepid /dev/cpuset/foreground/tasks /dev/stune/foreground/tasks