Remove unused global const variable am: 6dc643db27 am: 16e747fe60 am: 0b06be49cc

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

Change-Id: I7f3ab7b082522fdc7cb4f9fc1012834b2c3adf07
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>