Changed default non-full tests to be prebuild.

Also added ability to turn off non-prebuild manually.

Change-Id: I0315ac43703a9c7e79812658523013799fb5d5dd
diff --git a/build/Android.common_test.mk b/build/Android.common_test.mk
index 4987567..683674d 100644
--- a/build/Android.common_test.mk
+++ b/build/Android.common_test.mk
@@ -57,8 +57,8 @@
 # Do you want run-tests with relocation disabled?
 ART_TEST_RUN_TEST_NO_RELOCATE ?= $(ART_TEST_FULL)
 
-# Do you want run-tests with prebuild enabled?
-ART_TEST_RUN_TEST_PREBUILD ?= true
+# Do you want run-tests with prebuild disabled?
+ART_TEST_RUN_TEST_NO_PREBUILD ?= $(ART_TEST_FULL)
 
 # Define the command run on test failure. $(1) is the name of the test. Executed by the shell.
 define ART_TEST_FAILED