Support for install multiple boot images.

Bug: 119800099
Test: m && /system/framework/arm/apex*.art files exist
Change-Id: I78023f1086446c2c44ff6b282993537b053c0588
diff --git a/core/dex_preopt_config.mk b/core/dex_preopt_config.mk
index 72d3345..9bf2be8 100644
--- a/core/dex_preopt_config.mk
+++ b/core/dex_preopt_config.mk
@@ -91,6 +91,7 @@
   $(call add_json_bool, DisablePreopt,                      $(call invert_bool,$(filter true,$(WITH_DEXPREOPT))))
   $(call add_json_list, DisablePreoptModules,               $(DEXPREOPT_DISABLED_MODULES))
   $(call add_json_bool, OnlyPreoptBootImageAndSystemServer, $(filter true,$(WITH_DEXPREOPT_BOOT_IMG_AND_SYSTEM_SERVER_ONLY)))
+  $(call add_json_bool, GenerateApexImage,                  $(filter true,$(DEXPREOPT_GENERATE_APEX_IMAGE)))
   $(call add_json_bool, DontUncompressPrivAppsDex,          $(filter true,$(DONT_UNCOMPRESS_PRIV_APPS_DEXS)))
   $(call add_json_list, ModulesLoadedByPrivilegedModules,   $(PRODUCT_LOADED_BY_PRIVILEGED_MODULES))
   $(call add_json_bool, HasSystemOther,                     $(BOARD_USES_SYSTEM_OTHER_ODEX))