ilo: convert BLT to use ilo_builder

Make these changes

  ilo_cp_begin()    -> ilo_builder_batch_pointer()
  ilo_cp_write()    -> direct memory set
  ilo_cp_write_bo() -> ilo_builder_batch_reloc()

and make sure there is no implicit flush.  Use this chance to drop the
"_emit_" infix.
ilo: convert GPE surface functions to use ilo_builder

Make these changes

  ilo_cp_steal_ptr() and memcpy()   -> ilo_builder_surface_write()
  ilo_cp_steal() and ilo_cp_write() -> ilo_builder_surface_write()
  ilo_cp_write_bo()                 -> ilo_builder_surface_reloc()

and use this chance to drop the "_emit_" infix.
ilo: convert GPE state functions to use ilo_builder

Make these changes

  ilo_cp_steal_ptr() and memcpy() -> ilo_builder_state_write()
  ilo_cp_steal_ptr()              -> ilo_builder_state_pointer()

and use this chance to drop the "_emit_" infix.