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.
   */
  
  #ifndef _BOOT_PLAT_H
  #define _BOOT_PLAT_H
  
*** 88,98 ****
  /* machdep.c */
  extern int  vac;
  
  extern void     fiximp(void);
  extern void     retain_nvram_page();
- extern int      cpu_is_ultrasparc_1(void);
  
  
  /* memlist.c */
  extern void             init_memlists(void);
  extern struct memlist   *fill_memlists(char *name, char *prop,
--- 89,98 ----