11630 remove checks for 64-bit capable hardware

*** 19,28 ****
--- 19,29 ----
  # CDDL HEADER END
  #
  #
  # Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
+ # Copyright 2019 Peter Tribble.
  #
  # psm/stand/boot/sparcv9/ieee1275/sun4u/Makefile
  #
  #
  TOPDIR =        ../../../../../../..
*** 58,68 ****
          prom_map.c              \
          prom_mem.c              \
          prom_mmu.c              \
          prom_retain.c           \
          prom_sparc.c            \
-         prom_vercheck.c         \
          prom_vername.c
  
  KARCH =         sun4u
  MMU =           sfmmu
  
--- 59,68 ----