Remove danielnorman@ from OWNERs. am: 54c128abe9

Original change: https://android-review.googlesource.com/c/platform/tools/treble/+/2118357

Change-Id: Iaebd34cbd36ec1a8754182c110bc50ced7713d86
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>