vendor: include gapps namespace

Change-Id: I249f8996e0a7582abadafcdb59011d356331bae5
diff --git a/config/BoardConfigSoong.mk b/config/BoardConfigSoong.mk
index 24183bf..bdb6cd2 100644
--- a/config/BoardConfigSoong.mk
+++ b/config/BoardConfigSoong.mk
@@ -14,6 +14,8 @@
 
 SOONG_CONFIG_NAMESPACES += omniromVarsPlugin
 
+PRODUCT_SOONG_NAMESPACES += vendor/gapps
+
 SOONG_CONFIG_omniromVarsPlugin :=
 
 define addVar