Fix Build file for CtsExternalPrint

fix the missing CtsExternal apk.

Test: make cts
Bug: None
Change-Id: Iacbfb4a83ce3cc16c243fb92eb36b42fdeaf20eb
Merged-in: I06a32f6311c77a13b4a50c929332eded16a7c1a5
diff --git a/tests/tests/print/Android.mk b/tests/tests/print/Android.mk
new file mode 100644
index 0000000..908807a
--- /dev/null
+++ b/tests/tests/print/Android.mk
@@ -0,0 +1,15 @@
+# Copyright (C) 2019 The Android Open Source Project
+# #
+# # Licensed under the Apache License, Version 2.0 (the "License");
+# # you may not use this file except in compliance with the License.
+# # You may obtain a copy of the License at
+# #
+# #      http://www.apache.org/licenses/LICENSE-2.0
+# #
+# # Unless required by applicable law or agreed to in writing, software
+# # distributed under the License is distributed on an "AS IS" BASIS,
+# # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# # See the License for the specific language governing permissions and
+# # limitations under the License.
+
+include $(call all-subdir-makefiles)