Migrate buildinfo.sh script into Soong

To build system.img in Soong, we need all artifacts including
build.prop. This fully migrates buildinfo.prop file into Soong as a
first step to build build.prop on Soong.

Bug: 322090587
Test: compare build.prop before and after
Test: build multiple times and see build.prop isn't rebuilt
Change-Id: Icaa7e1fdab2a8c169ac00949d3aaf6c8212a1872

scripts/Android.bp

@@ -305,3 +305,14 @@ python_binary_host {
         },
     },
 }
+
+python_binary_host {
+    name: "buildinfo",
+    main: "buildinfo.py",
+    srcs: ["buildinfo.py"],
+    version: {
+        py3: {
+            embedded_launcher: true,
+        },
+    },
+}