Use Z_BEST_COMPRESSION for compress-package

Saves a few extra KBs with LOCAL_COMPRESSED_MODULE

Bug: 191841942
Bug: 282617419
Test: boot && apks uncompressed
Change-Id: I1a8c6cdfc194b68b2f2c9fb398851a7a4b7440bf
diff --git a/core/definitions.mk b/core/definitions.mk
index a0337c2..778485e 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -2862,7 +2862,7 @@
 define compress-package
 $(hide) \
   mv $@ $@.uncompressed; \
-  $(MINIGZIP) -c $@.uncompressed > $@.compressed; \
+  $(MINIGZIP) -9 -c $@.uncompressed > $@.compressed; \
   rm -f $@.uncompressed; \
   mv $@.compressed $@;
 endef