libdiced_open_dice: Visibility to Secretkeeper VTS

This is required for constructing sample dice chains for testing.

Test: Builds
Bug: 291224769
Change-Id: I515b30ab1868897ba97a351f1c2184a82203f276
diff --git a/libs/dice/open_dice/Android.bp b/libs/dice/open_dice/Android.bp
index ea94ebf..79d0b96 100644
--- a/libs/dice/open_dice/Android.bp
+++ b/libs/dice/open_dice/Android.bp
@@ -55,6 +55,7 @@
         "libopen_dice_android",
     ],
     visibility: [
+        "//hardware/interfaces/security/secretkeeper/aidl/vts",
         "//packages/modules/Virtualization:__subpackages__",
         "//system/authgraph/tests:__subpackages__",
         "//system/secretkeeper/client:__subpackages__",