Revert "Use NetworkStackNext as preinstalled network stack"

This reverts commit 7b7af5425966566fab3aebd1e154ef675539d090.

Reason for revert: Broke tests in b/144168912

Change-Id: I01d7b76350aba6a902c89d357e0f30b28a1c03c4
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 72caee2..2fd0312 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -206,7 +206,7 @@
     mtpd \
     ndc \
     netd \
-    NetworkStackNext \
+    NetworkStack \
     org.apache.http.legacy \
     otacerts \
     PackageInstaller \