Hammerhead camera: Fix unused variables

For build-system CFLAGS clean-up, fix unused variables.

This only cleans the parts of this project using -Werror.

Change-Id: I26ee6aa9c08c3f7ff5a28e4995bbcc4748910e94
Squash cmhw controls for kcal and vibrator

Change-Id: Ib9ce8047fff6983ecb94e8d8efd3ee5f0727aae0
hammerhead: Add sepolicy for hardware tunables

Change-Id: Icd4588175c1fca628fa3027d6cefd53fab7c90e7