Rename UpdatableSystemServerJars to ApexSystemServerJars.

This is consistent with naming for boot jars, e.g. ApexBootJars.

Bug: 191127295
Test: presubmit
Change-Id: I1d4378e0d2dc73af2ffd8c4cc66ab8c0e2981d2f
diff --git a/core/dex_preopt_config.mk b/core/dex_preopt_config.mk
index a75b220..0c806c1 100644
--- a/core/dex_preopt_config.mk
+++ b/core/dex_preopt_config.mk
@@ -108,7 +108,7 @@
   $(call add_json_list, ArtApexJars,                             $(filter $(PRODUCT_BOOT_JARS),$(ART_APEX_JARS)))
   $(call add_json_list, SystemServerJars,                        $(PRODUCT_SYSTEM_SERVER_JARS))
   $(call add_json_list, SystemServerApps,                        $(PRODUCT_SYSTEM_SERVER_APPS))
-  $(call add_json_list, UpdatableSystemServerJars,               $(PRODUCT_APEX_SYSTEM_SERVER_JARS))
+  $(call add_json_list, ApexSystemServerJars,                    $(PRODUCT_APEX_SYSTEM_SERVER_JARS))
   $(call add_json_bool, BrokenSuboptimalOrderOfSystemServerJars, $(PRODUCT_BROKEN_SUBOPTIMAL_ORDER_OF_SYSTEM_SERVER_JARS))
   $(call add_json_list, SpeedApps,                               $(PRODUCT_DEXPREOPT_SPEED_APPS))
   $(call add_json_list, PreoptFlags,                             $(PRODUCT_DEX_PREOPT_DEFAULT_FLAGS))