Fix issues #5587467 and #5587141.

5587467 android.content.res.cts.ConfigTest#testDensity fails on IML39 soju-userdebug
5587141 android.content.res.cts.ConfigTest#testCombinations fails on IML39 soju-userdebug

Some of the test's resources were being stripped.

Change-Id: I935c4e848c5744614a40d84ba826c198cd4545b2
diff --git a/tests/Android.mk b/tests/Android.mk
index 31a2931..cfaeb57 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -28,7 +28,9 @@
 LOCAL_JNI_SHARED_LIBRARIES := libcts_jni
 
 # Resource unit tests use a private locale and some densities
-LOCAL_AAPT_FLAGS = -c xx_YY -c cs -c 320dpi -c 240dpi -c 160dpi
+LOCAL_AAPT_FLAGS = -c xx_YY -c cs -c 320dpi -c 240dpi -c 160dpi -c 32dpi \
+        --preferred-configurations 320dpi --preferred-configurations 240dpi \
+        --preferred-configurations 160dpi --preferred-configurations 32dpi
 
 LOCAL_PACKAGE_NAME := CtsTestStubs