Disable boot.zip on eng build.

boot.zip is not useful on eng build.

Bug: 310681823
Test: lunch aosp_cf_x86_64_phone-trunk_staging-eng && m dist
Change-Id: I40eb73d1783381bd38b644709769d5ff51397b3e
diff --git a/core/dex_preopt.mk b/core/dex_preopt.mk
index 6791125..37a389f 100644
--- a/core/dex_preopt.mk
+++ b/core/dex_preopt.mk
@@ -58,6 +58,7 @@
 # We can do this only if preopt is enabled and if the product uses libart config (which sets the
 # default properties for preopting).
 ifeq ($(WITH_DEXPREOPT), true)
+ifneq ($(WITH_DEXPREOPT_ART_BOOT_IMG_ONLY), true)
 ifeq ($(PRODUCT_USES_DEFAULT_ART_CONFIG), true)
 
 boot_zip := $(PRODUCT_OUT)/boot.zip
@@ -152,4 +153,5 @@
 
 endif  #ART_MODULE_BUILD_FROM_SOURCE || MODULE_BUILD_FROM_SOURCE
 endif  #PRODUCT_USES_DEFAULT_ART_CONFIG
+endif  #WITH_DEXPREOPT_ART_BOOT_IMG_ONLY
 endif  #WITH_DEXPREOPT