Enable windows target

`//tools/apksig` build targets will soon depend
on this, and windows must be enabled (transitively)
on all dependencies.

Bug: 319296492
Test: TH
Change-Id: Id4280cb4ccf371ebae114135d6f2e38a2b823071
diff --git a/Android.bp b/Android.bp
index b5f1920..7e5c7fc 100644
--- a/Android.bp
+++ b/Android.bp
@@ -55,6 +55,11 @@
     srcs: ["ri/src/main/java/**/*.java"],
     // b/267831518: Pin tradefed and dependencies to Java 11.
     java_version: "11",
+    target: {
+        windows: {
+            enabled: true,
+        },
+    },
 }
 
 // Compatibility name