Remove unused global const variable am: 6dc643db27

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

Change-Id: I881c63488eee3a8dbe796f0d0d5912b929391b08
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>