Add error-prone support

Add support for compiling java sources with the error-prone tool.

Test: m -j checkbuild
Change-Id: Ieb4ee0e05f8f34a52ed7bcf1c7cbacf1c9c4d0b5
diff --git a/Android.bp b/Android.bp
index cc28c98..df3babc 100644
--- a/Android.bp
+++ b/Android.bp
@@ -222,6 +222,7 @@
     ],
     srcs: [
         "java/config/config.go",
+        "java/config/errorprone.go",
         "java/config/makevars.go",
     ],
 }