Add host_supported: true

This is a dependency for system/authgraph/tests, which has
host_supported=true

Test: build with this change
Change-Id: Ieb57a34ed71ef14d511a9a0ed38d02205369b0e5
diff --git a/libs/dice/open_dice/Android.bp b/libs/dice/open_dice/Android.bp
index 3fae8a5..2d0f52c 100644
--- a/libs/dice/open_dice/Android.bp
+++ b/libs/dice/open_dice/Android.bp
@@ -34,6 +34,7 @@
 rust_library {
     name: "libdiced_open_dice",
     defaults: ["libdiced_open_dice_defaults"],
+    host_supported: true,
     vendor_available: true,
     rustlibs: [
         "libopen_dice_android_bindgen",