Merge "Disable eject button for StubVolumes" am: fef33579a6 am: e817b6d6e7 am: 2ab139414a

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1914530

Change-Id: I0e2aee7f15f844c39ea336be8e5dd8720ab480e4