sm6225-common: Define a soong namespace

Change-Id: Ida759ee1786c667e766da29103f0ecb54950c104
diff --git a/common.mk b/common.mk
index bd47c49..1cf6206 100644
--- a/common.mk
+++ b/common.mk
@@ -19,3 +19,7 @@
 
 # Shipping API Level
 PRODUCT_SHIPPING_API_LEVEL := 33
+
+# Soong namespaces
+PRODUCT_SOONG_NAMESPACES += \
+    $(LOCAL_PATH)