Add dmuserd to PRODUCT_PACKAGES_DEBUG

This is a simple dm-user daemon that will be used for the QA tests.

Test: manual, b/171749628
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Change-Id: I37b78a1479f08f37fe7cff3f2e201dc6d8a6e584
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 4607edb..4d92db7 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -374,6 +374,7 @@
 PRODUCT_PACKAGES_DEBUG := \
     adb_keys \
     arping \
+    dmuserd \
     gdbserver \
     idlcli \
     init-debug.rc \