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

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

Change-Id: I402e32dd55e1d5a10361dbd35af2b359e493a690
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>