Add update_device to be built and be packaged into otatools.zip.

Change-Id: Ifd204a0d67815e4a443eb6c34c4545b2484bdf57
diff --git a/core/Makefile b/core/Makefile
index 07d705e..cb7ea94 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -5323,6 +5323,7 @@
   toybox \
   tune2fs \
   unpack_bootimg \
+  update_device \
   update_host_simulator \
   validate_target_files \
   verity_signer \