Revert "Hash ICC ID used in the notification tag for voicemail notifications." am: 6f32f84a36 am: cdd8f9d2f9 am: ae6c7fa98d am: 272c1b917d am: ecf149527f am: 76282c26cb

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Dialer/+/16222616

Change-Id: I6c4b4040fdd95e128d5b150edb66b916d41f1c2f