Fix the chips tests so they build

Change-Id: I8d2c978c0f346ffa3b8fa0f993efb6df6b0c224a
diff --git a/chips/Android.mk b/chips/Android.mk
index 4a7977a..6aa8a01 100644
--- a/chips/Android.mk
+++ b/chips/Android.mk
@@ -21,4 +21,9 @@
      $(call all-java-files-under, src) \
      $(call all-logtags-files-under, src)
 LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res
-include $(BUILD_STATIC_JAVA_LIBRARY)
\ No newline at end of file
+include $(BUILD_STATIC_JAVA_LIBRARY)
+
+##################################################
+# Build all sub-directories
+
+include $(call all-makefiles-under,$(LOCAL_PATH))
\ No newline at end of file