Add product variable for PRODUCT_USE_SOONG_NOTICE_XML

Bug: 330949782
Change-Id: I5028d27ff700cd72eecd093421b54f62f0cd83a6
diff --git a/android/variable.go b/android/variable.go
index 3e637fe..4867067 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -551,6 +551,8 @@
 	SystemExtManifestFiles []string `json:",omitempty"`
 	DeviceManifestFiles    []string `json:",omitempty"`
 	OdmManifestFiles       []string `json:",omitempty"`
+
+	UseSoongNoticeXML *bool `json:",omitempty"`
 }
 
 type PartitionQualifiedVariablesType struct {