This simplifies make output/logic Tested with: `cd sys/modules; make ALL_MODULES=` on amd64 MFC after: 1 month Sponsored by: Dell EMC Isilon
option left but actually consumed by ada(4), so move it to opt_ada.h and get rid of opt_ata.h. - Fix stand-alone build of atacore(4) by adding opt_cam.h. - Use __FBSDID. - Use DEVMETHOD_END. - Use NULL instead of 0 for pointers.