Revert "Rename dalvik.vm.usejit to debug.dalvik.vm.usejit"

Bug: 19735273

This reverts commit 3abfcfc17b022a5af9d37403f81fae027ab850b9.

Change-Id: Iac930925ab6d5cd5947fa4077c8d93e2984927d5
diff --git a/core/main.mk b/core/main.mk
index 61b2e5a..0e058af 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -393,7 +393,7 @@
   # Don't compile apps on eng builds to speed startup
   ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.dex2oat-filter=interpret-only
 endif
-  ADDITIONAL_BUILD_PROPERTIES += debug.dalvik.vm.usejit=true
+  ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.usejit=true
 endif
 
 ## sdk ##