Extend rpc_unstable visibility to virtualization

packages/modules/Virtualization is in active development, and various
packages under the repo use libbinder_rpc_unstable. This extends the
visibility to the entire repo for convenience. It shouldn't be too
harmful because we have to refactor the whole repo when removing
libbinder_rpc_unstable.

Test: build
Change-Id: I17e7c58b510dd6c38136fd604dea0c34063106db
diff --git a/libs/binder/Android.bp b/libs/binder/Android.bp
index 9875079..572d948 100644
--- a/libs/binder/Android.bp
+++ b/libs/binder/Android.bp
@@ -338,11 +338,7 @@
     // This library is intentionally limited to these targets, and it will be removed later.
     // Do not expand the visibility.
     visibility: [
-        "//packages/modules/Virtualization/authfs:__subpackages__",
-        "//packages/modules/Virtualization/compos:__subpackages__",
-        "//packages/modules/Virtualization/microdroid",
-        "//packages/modules/Virtualization/microdroid_manager",
-        "//packages/modules/Virtualization/virtualizationservice",
+        "//packages/modules/Virtualization:__subpackages__",
     ],
 }