Add pendsv debugging flags to top Makefile.
Add pendsv debugging flags to top Makefile.

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