Add a_sns_test to wahoo debug builds.

Bug: 124465434
Test: Verified a_sns_test is installed and runs on Walleye. See details in
testing done comment in
https://googleplex-android-review.git.corp.google.com/6870258 .
Change-Id: I9fe33642242d0fde4321bb88a2b6de5ee5ca03ab
diff --git a/device.mk b/device.mk
index 5a2b1d1..b2bd87a 100755
--- a/device.mk
+++ b/device.mk
@@ -150,6 +150,7 @@
 
 # The following modules are included in debuggable builds only.
 PRODUCT_PACKAGES_DEBUG += \
+    a_sns_test \
     bootctl \
     update_engine_client