x11: tiny sp_ opt on jh512 (0.05ms)

modified a bit.. (and removed the mixed dos end of lines ^M)

also, remove the max reg count, now determined with __launch_bounds__
groestl: enhance sp andmask optimisation

profile of quark_groestl512_gpu_hash_64_quad()
 before: 35.692ms
 sp : 35.151ms
 new: 35.061ms