sepolicy change for NetworkStack signature

Update the seinfo to the new network_stack seinfo, as the network stack
is now using its own certificate.
Remove the hard-coded package name, which may differ depending on
devices, and specify (uid, signature, priv-app) instead.

Bug: 124033493
Test: m
Change-Id: If3bbc21cf83f5d17406e9615833ee43011c9c9bc
diff --git a/private/mac_permissions.xml b/private/mac_permissions.xml
index 1fcd2a4..7fc37c1 100644
--- a/private/mac_permissions.xml
+++ b/private/mac_permissions.xml
@@ -56,4 +56,7 @@
       <seinfo value="media" />
     </signer>
 
+    <signer signature="@NETWORK_STACK" >
+      <seinfo value="network_stack" />
+    </signer>
 </policy>