omni: remove vendor/gapps soong namespace.

It's already defined in our gapps gapps-vendor.mk.
It will remove the duplicate grep PRODUCT_SOONG_NAMESPACES vendor/gapps

Change-Id: Idfe1177537f450d822050a2541c23531b33f16f3
diff --git a/config/BoardConfigSoong.mk b/config/BoardConfigSoong.mk
index 29d5c38..e677c9d 100644
--- a/config/BoardConfigSoong.mk
+++ b/config/BoardConfigSoong.mk
@@ -14,10 +14,6 @@
 
 SOONG_CONFIG_NAMESPACES += omniromVarsPlugin
 
-ifeq ($(ROM_BUILDTYPE),GAPPS)
-PRODUCT_SOONG_NAMESPACES += vendor/gapps
-endif
-
 SOONG_CONFIG_omniromVarsPlugin :=
 
 define addVar