openriac: Remove unused nommu_dump_state function

When compiling with W=1 enabling -Wmissing-prototypes the compiler
warns:

  arch/openrisc/kernel/traps.c:146:6: error: no previous prototype for 'nommu_dump_state' [-Werror=missing-prototypes]

This function is not used so remove it.
Reported-by: Arnd Bergmann <arnd@arndb.de>
Closes: https://lore.kernel.org/linux-kernel/20230810141947.1236730-17-arnd@kernel.org/Signed-off-by: Stafford Horne <shorne@gmail.com>

arch/openrisc/kernel/traps.c

@@ -36,7 +36,6 @@
 #include <asm/unwinder.h>
 #include <asm/sections.h>
 
-static int kstack_depth_to_print = 0x180;
 int lwa_flag;
 static unsigned long __user *lwa_addr;
 
@@ -153,80 +152,6 @@ void show_registers(struct pt_regs *regs)
 	printk("\n");
 }
 
-void nommu_dump_state(struct pt_regs *regs,
-		      unsigned long ea, unsigned long vector)
-{
-	int i;
-	unsigned long addr, stack = regs->sp;
-
-	printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
-
-	printk("CPU #: %d\n"
-	       "   PC: %08lx    SR: %08lx    SP: %08lx\n",
-	       0, regs->pc, regs->sr, regs->sp);
-	printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
-	       0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
-	printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
-	       regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
-	printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
-	       regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
-	printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
-	       regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
-	printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
-	       regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
-	printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
-	       regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
-	printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
-	       regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
-	printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
-	       regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
-	printk("  RES: %08lx oGPR11: %08lx\n",
-	       regs->gpr[11], regs->orig_gpr11);
-
-	printk("Process %s (pid: %d, stackpage=%08lx)\n",
-	       ((struct task_struct *)(__pa(current)))->comm,
-	       ((struct task_struct *)(__pa(current)))->pid,
-	       (unsigned long)current);
-
-	printk("\nStack: ");
-	printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
-	for (i = 0; i < kstack_depth_to_print; i++) {
-		if (((long)stack & (THREAD_SIZE - 1)) == 0)
-			break;
-		stack++;
-
-		printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
-		       *((unsigned long *)(__pa(stack))));
-	}
-	printk("\n");
-
-	printk("Call Trace:   ");
-	i = 1;
-	while (((long)stack & (THREAD_SIZE - 1)) != 0) {
-		addr = *((unsigned long *)__pa(stack));
-		stack++;
-
-		if (kernel_text_address(addr)) {
-			if (i && ((i % 6) == 0))
-				printk("\n ");
-			printk(" [<%08lx>]", addr);
-			i++;
-		}
-	}
-	printk("\n");
-
-	printk("\nCode: ");
-
-	for (i = -24; i < 24; i++) {
-		unsigned long word;
-
-		word = ((unsigned long *)(__pa(regs->pc)))[i];
-
-		print_data(regs->pc, word, i);
-	}
-	printk("\n");
-}
-
 /* This is normally the 'Oops' routine */
 void __noreturn die(const char *str, struct pt_regs *regs, long err)
 {