Revert "Use Soong-built system/build.prop"

Revert submission 3184480-system_build_prop_soong

Reason for revert: breaks ndk and mainline build 

Reverted changes: /q/submissionid:3184480-system_build_prop_soong

Change-Id: I1738cc0a85428d3fd0a0ee196fa6d54270e6f1ec

scripts/Android.bp

@@ -305,6 +305,12 @@ python_binary_host {
     srcs: ["gen_build_prop.py"],
 }
 
+python_binary_host {
+    name: "buildinfo",
+    main: "buildinfo.py",
+    srcs: ["buildinfo.py"],
+}
+
 python_binary_host {
     name: "extra_install_zips_file_list",
     main: "extra_install_zips_file_list.py",