Link against libandroid_net instead of the full libandroid.

We only need the native network API, now available in libandroid_net.
This prevents linking against libandroid which is huge compared to just
the libandroid_net copy.

Bug: 32842753
Test: `make dist`
Change-Id: Iafee47589448b672d8872accab2a06b5d1c7bd8f
diff --git a/Android.mk b/Android.mk
index 8f67dc4..a18f754 100644
--- a/Android.mk
+++ b/Android.mk
@@ -443,7 +443,7 @@
 ue_libupdate_engine_android_exported_shared_libraries := \
     $(ue_libpayload_consumer_exported_shared_libraries) \
     $(ue_libupdate_engine_boot_control_exported_shared_libraries) \
-    libandroid \
+    libandroid_net \
     libbinder \
     libbinderwrapper \
     libbrillo-binder \