Link to libsnapshot_cow where libsnapshot is linked.

Bug: 168554689
Test: builds
Change-Id: Ie75bba98c8a346fcad1588b678648526a4c51a5c
diff --git a/Android.bp b/Android.bp
index 28e1bab..c5e66e3 100644
--- a/Android.bp
+++ b/Android.bp
@@ -199,6 +199,7 @@
         "libgsi",
         "libpayload_consumer",
         "libsnapshot",
+        "libsnapshot_cow",
         "update_metadata-protos",
     ],
     shared_libs: [