Remove unused global const variable am: 6dc643db27

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/3298493

Change-Id: I11893d06120d5b71f824bea92f02f9bf78c09200
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>