Add a Network flags file and flag for b/302033535

Add a network flags control file.

Bug: 302033535
Test: compilation
Change-Id: Id7eba7cb15adac7a1b98516419d776c2f1e01d03
diff --git a/flags/Android.bp b/flags/Android.bp
index 7486677..a278641 100644
--- a/flags/Android.bp
+++ b/flags/Android.bp
@@ -26,6 +26,7 @@
       "ims.aconfig",
       "messaging.aconfig",
       "misc.aconfig",
+      "network.aconfig",
       "subscription.aconfig",
       "uicc.aconfig",
       "satellite.aconfig",