Use NetworkFactory from frameworks/libs/net.

This allows Telephony to avoid depending on hidden API for
NetworkFactory.

Test: atest FrameworksTelephonyTests
Bug: 138306002
Change-Id: Idb12389069c4c95bf09dc835186358ebeb1f9d76
diff --git a/Android.bp b/Android.bp
index ca895be..21d4c0f 100644
--- a/Android.bp
+++ b/Android.bp
@@ -71,6 +71,7 @@
     srcs: [
         ":opt-telephony-common-srcs",
         ":framework-telephony-stack-shared-srcs",
+        ":net-utils-telephony-common-srcs",
         "src/java/**/I*.aidl",
         "src/java/**/*.logtags",
     ],