m68k/sun3: Remove unselectable code in prom_init()

This was copied from SPARC, but isn't relevant for the supported Sun-3
models.

[Geert] Also remove the related extern declarations, and update the
	comment about prom_init().
Reported-by: Sarah Nadi <snadi@uwaterloo.ca>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/sun3/prom/init.c

@@ -22,57 +22,13 @@ int prom_root_node;
 struct linux_nodeops *prom_nodeops;
 
 /* You must call prom_init() before you attempt to use any of the
- * routines in the prom library.  It returns 0 on success, 1 on
- * failure.  It gets passed the pointer to the PROM vector.
+ * routines in the prom library.
+ * It gets passed the pointer to the PROM vector.
  */
 
-extern void prom_meminit(void);
-extern void prom_ranges_init(void);
-
 void __init prom_init(struct linux_romvec *rp)
 {
 	romvec = rp;
-#ifndef CONFIG_SUN3
-	switch(romvec->pv_romvers) {
-	case 0:
-		prom_vers = PROM_V0;
-		break;
-	case 2:
-		prom_vers = PROM_V2;
-		break;
-	case 3:
-		prom_vers = PROM_V3;
-		break;
-	case 4:
-		prom_vers = PROM_P1275;
-		prom_printf("PROMLIB: Sun IEEE Prom not supported yet\n");
-		prom_halt();
-		break;
-	default:
-		prom_printf("PROMLIB: Bad PROM version %d\n",
-			    romvec->pv_romvers);
-		prom_halt();
-		break;
-	};
-
-	prom_rev = romvec->pv_plugin_revision;
-	prom_prev = romvec->pv_printrev;
-	prom_nodeops = romvec->pv_nodeops;
-
-	prom_root_node = prom_getsibling(0);
-	if((prom_root_node == 0) || (prom_root_node == -1))
-		prom_halt();
-
-	if((((unsigned long) prom_nodeops) == 0) ||
-	   (((unsigned long) prom_nodeops) == -1))
-		prom_halt();
-
-	prom_meminit();
-
-	prom_ranges_init();
-#endif
-//	printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
-//	       romvec->pv_romvers, prom_rev);
 
 	/* Initialization successful. */
 	return;