[MS15.3] Move SUBSCRIBER_ID_MATCH_RULE_* constants to static lib

Subscriber Id Match Rules won't be exposed as system Api.
Any caller who references NetworkTemplate#SUBSCRIBER_ID_MATCH_RULE_*
should use the one in NetworkStatsUtils instead.
And remove the need of the constants as soon as possible.

Test: atest NetworkPolicyManagerServiceTest \
      FrameworksNetTests
Bug: 204830222
Change-Id: I7c0ca89c8e2a860f5bab29ac6f9bc5af2a548b99
diff --git a/staticlibs/framework/com/android/net/module/util/NetworkStatsUtils.java b/staticlibs/framework/com/android/net/module/util/NetworkStatsUtils.java
index 13bbe76..7ea40a1 100644
--- a/staticlibs/framework/com/android/net/module/util/NetworkStatsUtils.java
+++ b/staticlibs/framework/com/android/net/module/util/NetworkStatsUtils.java
@@ -52,4 +52,18 @@
         }
         return r / den;
     }
+
+    /**
+     * Value of the match rule of the subscriberId to match networks with specific subscriberId.
+     *
+     * @hide
+     */
+    public static final int SUBSCRIBER_ID_MATCH_RULE_EXACT = 0;
+    /**
+     * Value of the match rule of the subscriberId to match networks with any subscriberId which
+     * includes null and non-null.
+     *
+     * @hide
+     */
+    public static final int SUBSCRIBER_ID_MATCH_RULE_ALL = 1;
 }