add android.permission.LOOP_RADIO for access to loop radio device

Change-Id: I811d70fa67aa758122678809f32b8aade42ced0f
diff --git a/data/etc/platform.xml b/data/etc/platform.xml
index 83ecdd9..cf04b5c 100644
--- a/data/etc/platform.xml
+++ b/data/etc/platform.xml
@@ -106,6 +106,10 @@
         <group gid="net_bw_acct" />
     </permission>
 
+    <permission name="android.permission.LOOP_RADIO" >
+        <group gid="loop_radio" />
+    </permission>
+
     <!-- ================================================================== -->
     <!-- ================================================================== -->
     <!-- ================================================================== -->