Revert "Move dexpreopting to Soong"

This reverts commit e736c58043290dad18ddbd690d554cdc413157a8.

Test: none
Bug: 119412419
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 0fce502..799425f 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -256,7 +256,6 @@
 LOCAL_SHARED_ANDROID_LIBRARIES:=
 LOCAL_SHARED_LIBRARIES:=
 LOCAL_SOONG_AAR :=
-LOCAL_SOONG_BUILT_INSTALLED :=
 LOCAL_SOONG_BUNDLE :=
 LOCAL_SOONG_CLASSES_JAR :=
 LOCAL_SOONG_DEX_JAR :=
@@ -279,6 +278,7 @@
 LOCAL_STATIC_JAVA_AAR_LIBRARIES:=
 LOCAL_STATIC_JAVA_LIBRARIES:=
 LOCAL_STATIC_LIBRARIES:=
+LOCAL_STRIP_DEX:=
 LOCAL_STRIP_MODULE:=
 LOCAL_SYSTEM_SHARED_LIBRARIES:=none
 LOCAL_TARGET_REQUIRED_MODULES:=