k053246/k055673: updated to use delegates and inline configs. nw.

as before, these changes are mostly driver-level, so I hope they do 
not conflict with anyone else's work. the only relevant change for the 
device code is the removal of some redundant variables (from the 
interface) and of  alt_k055673_vh_start + k053247_set_sprite_offs, 
which have been replaced by the proper machine configs.