Remove unused global const variable am: 6dc643db27 am: 838ace29ba am: 82e07b6550 am: 60abb3827c

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

Change-Id: I6608cf3e8d76726b590756b8aa7d50ed288fba42
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>