Remove unused global const variable am: 6dc643db27 am: 838ace29ba

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

Change-Id: I0b728d2b6d1e1fe3bae0efccd4dbf24d7ff3b272
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>