Add product_config module

product_config module will export productVariables struct (defined in
android/variable.go). Other modules can depend on product_Config module
to read product variables, without needing to update Soong.

Bug: 346214955
Test: build and see output of product_config module
Change-Id: I06e1d2716dc2a8b90984bb46c5fc901cd1ca5020

scripts/Android.bp

@@ -291,6 +291,14 @@ python_binary_host {
     ],
 }
 
+python_binary_host {
+    name: "merge_json",
+    main: "merge_json.py",
+    srcs: [
+        "merge_json.py",
+    ],
+}
+
 python_binary_host {
     name: "buildinfo",
     main: "buildinfo.py",