cm: Remove obsolete persist.sys.dalvik.multithread property

Change-Id: I0d04f50dcca1454a7f38d8076b8418f67b140906
diff --git a/config/common.mk b/config/common.mk
index 69340a5..2a87112 100644
--- a/config/common.mk
+++ b/config/common.mk
@@ -66,10 +66,6 @@
 PRODUCT_PROPERTY_OVERRIDES += \
     ro.build.selinux=1
 
-# Disable multithreaded dexopt by default
-PRODUCT_PROPERTY_OVERRIDES += \
-    persist.sys.dalvik.multithread=false
-
 # Thank you, please drive thru!
 PRODUCT_PROPERTY_OVERRIDES += persist.sys.dun.override=0