[SPARC32]: Kill redundant romvec definition from system.h

arch/sparc/kernel/devices.c

@@ -72,7 +72,7 @@ device_scan(void)
 		if (linux_num_cpus == 0) {
 			printk("No CPU nodes found, cannot continue.\n");
 			/* Probably a sun4e, Sun is trying to trick us ;-) */
-			halt();
+			prom_halt();
 		}
 		printk("Found %d CPU prom device tree node(s).\n", linux_num_cpus);
 	}

arch/sparc/kernel/ioport.c

@@ -777,7 +777,7 @@ void ioport_init(void)
 	default:
 		printk("ioport_init: cpu type %d is unknown.\n",
 		    sparc_cpu_model);
-		halt();
+		prom_halt();
 	};
 
 }

include/asm-sparc/system.h

@@ -53,9 +53,6 @@ extern unsigned long empty_bad_page;
 extern unsigned long empty_bad_page_table;
 extern unsigned long empty_zero_page;
 
-extern struct linux_romvec *romvec;
-#define halt() romvec->pv_halt()
-
 extern void sun_do_break(void);
 extern int serial_console;
 extern int stop_a_enabled;