pm-qa: for android update build tag to eng

- android builds are by default eng type. It helps build system to
  copy binaries to out-dir properly.
- bug: https://bugs.launchpad.net/linaro-android/+bug/1125984

Signed-off-by: Sanjay Singh Rawat <sanjay.rawat@linaro.org>
diff --git a/Android.mk b/Android.mk
index b3f12f6..a3b785d 100644
--- a/Android.mk
+++ b/Android.mk
@@ -3,7 +3,7 @@
 LOCAL_PATH:= $(call my-dir)
 
 include $(CLEAR_VARS)
-LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_TAGS := eng
 LOCAL_MODULE_CLASS := tests
 LOCAL_MODULE := Switches.sh
 LOCAL_SRC_FILES := ../../external/pm-qa/Switches.sh