Import some product definition variables to Soong

This change imports PRODUCT_DEVICE and PRODUCT_MODEL to Soong. these
products will be used to generate the android_device module.

Test: m nothing
Bug: 372486444
Change-Id: Ie243d030e8f8515cbcb46cf0d1ad45082c14ceb1
diff --git a/android/variable.go b/android/variable.go
index 51a239d..f40de7a 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -475,6 +475,8 @@
 
 	ProductManufacturer string `json:",omitempty"`
 	ProductBrand        string `json:",omitempty"`
+	ProductDevice       string `json:",omitempty"`
+	ProductModel        string `json:",omitempty"`
 
 	ReleaseVersion          string   `json:",omitempty"`
 	ReleaseAconfigValueSets []string `json:",omitempty"`