Add java config and share it with make

Add a java/config package to hold config information, and share
it with make through makevars.

Test: builds
Change-Id: I46c088bda0fe97a1823bfdd80fa692d0bf61da1b
diff --git a/Android.bp b/Android.bp
index c571e74..1eac394 100644
--- a/Android.bp
+++ b/Android.bp
@@ -188,6 +188,7 @@
         "soong",
         "soong-android",
         "soong-genrule",
+        "soong-java-config",
     ],
     srcs: [
         "java/androidmk.go",
@@ -202,6 +203,19 @@
 }
 
 bootstrap_go_package {
+    name: "soong-java-config",
+    pkgPath: "android/soong/java/config",
+    deps: [
+        "blueprint-proptools",
+        "soong-android",
+    ],
+    srcs: [
+        "java/config/config.go",
+        "java/config/makevars.go",
+    ],
+}
+
+bootstrap_go_package {
     name: "soong-python",
     pkgPath: "android/soong/python",
     deps: [