libhwbinder: disallow in ^device

It's empty, and imposes a cost. Users have been cleaned up.

Bug: 135686713
Test: N/A
Change-Id: Id515214983ea27cc897f9bd109423c879c5ec70f
diff --git a/Android.bp b/Android.bp
index 4ff1558..27988cb 100644
--- a/Android.bp
+++ b/Android.bp
@@ -113,7 +113,6 @@
     vendor_available: true,
 
     visibility: [
-        "//device:__subpackages__",
         "//vendor:__subpackages__",
     ],
 }