Handle new filetype 'linker_config'

Handle new filetype 'linker_config' which is configuration for
linkerconfig in json type and convert into protobuf in build time.

Bug: 169634881
Test: Build succeeded and cuttlefish boot succeeded
Change-Id: I56555fc738e6d6600d15a191a24f79a2ee747f52

scripts/Android.bp

@@ -206,3 +206,22 @@ python_binary_host {
         "ninja_rsp.py",
     ],
 }
+
+python_binary_host {
+    name: "conv_linker_config",
+    srcs: [
+        "conv_linker_config.py",
+    ],
+    version: {
+        py2: {
+            enabled: false,
+        },
+        py3: {
+            enabled: true,
+            embedded_launcher: true,
+        },
+    },
+    libs: [
+        "linker_config_proto",
+    ],
+}