Fix uses of all-subdir-makefiles

We should use all-makefiles-under instead.
all-subdir-makefiles can be used only before any "include" statement.
Before this change, both subdirs were actually not included.

Change-Id: I6bf35d07f294a5012c9322096f999ac26e37432f
diff --git a/libs/ui/tests/Android.mk b/libs/ui/tests/Android.mk
index 693a32a..700b604 100644
--- a/libs/ui/tests/Android.mk
+++ b/libs/ui/tests/Android.mk
@@ -45,4 +45,4 @@
 )
 
 # Build the manual test programs.
-include $(call all-subdir-makefiles)
+include $(call all-makefiles-under, $(LOCAL_PATH))