Unbind Attestation keys when freeing up namespace. am: d337c77271

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/security/+/18638770

Change-Id: Ic15ad66faf5a55a93e4cada08e1a55623c9a510d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>