universal7904: Add hardware/samsung to soong namespaces

See I78b1b9930a57bc01afda722b9f8a196c372f9d8b.

Change-Id: I634b562e12b70a0c060d449d3ba1d4e87204cf5d
diff --git a/universal7904-common.mk b/universal7904-common.mk
index 46db569..b8cdd11 100644
--- a/universal7904-common.mk
+++ b/universal7904-common.mk
@@ -238,6 +238,7 @@
     $(LOCAL_PATH) \
     hardware/google/interfaces \
     hardware/google/pixel \
+    hardware/samsung \
     hardware/samsung/aidl/power-libperfmgr
 
 # Thermal