(DO NOT MERGE) Revert "Make libart the default runtime"

This reverts commit 08d410f53249c18d752f56a881ed2335403080d4.
diff --git a/target/product/core_minimal.mk b/target/product/core_minimal.mk
index 79ba0d4..21a6e8b 100644
--- a/target/product/core_minimal.mk
+++ b/target/product/core_minimal.mk
@@ -72,7 +72,7 @@
     apache-xml \
     webviewchromium
 
-PRODUCT_RUNTIMES := runtime_libart_default
-PRODUCT_RUNTIMES += runtime_libdvm
+PRODUCT_RUNTIMES := runtime_libdvm_default
+PRODUCT_RUNTIMES += runtime_libart
 
 $(call inherit-product, $(SRC_TARGET_DIR)/product/base.mk)