Add zucchini to otatools.zip

Zucchini is a new diffing algorithm we plan to add to Android OTA, add
it to otatools.zip first.

Bug: 194237829
Test: th
Change-Id: I9561101decc2d13afb0a8d4329c3ecc044c96c9d
diff --git a/core/Makefile b/core/Makefile
index 24302d4..f6411ec 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -4377,6 +4377,7 @@
   verity_signer \
   verity_verifier \
   zipalign \
+  zucchini \
 
 # Additional tools to unpack and repack the apex file.
 INTERNAL_OTATOOLS_MODULES += \