Allow boards to define an extra cam timer pin.
Allow boards to define an extra cam timer pin.

openmv/openmv,iabdalkader/openmv,kwagyeman/openmv,iabdalkader/openmv,kwagyeman/openmv,openmv/openmv,openmv/openmv,kwagyeman/openmv,iabdalkader/openmv,iabdalkader/openmv,kwagyeman/openmv,openmv/openmv