Update OMV4 board config.
Update OMV4 board config.

* Note keeping everything in DTCM for now.

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