Link to libsnapshot_cow everywhere libsnapshot is linked.

Bug: 168554689
Test: recovery builds
Change-Id: I28a5d4a88914b10db1ca8298947afc2314a9ae8a
diff --git a/Android.bp b/Android.bp
index bd2d0b0..5dfbdbf 100644
--- a/Android.bp
+++ b/Android.bp
@@ -78,6 +78,7 @@
         "libminui",
         "librecovery_utils",
         "libotautil",
+        "libsnapshot_cow",
         "libsnapshot_nobinder",
         "update_metadata-protos",
     ],