[SPARC64]: Kill unused function 'kernel_enter_debugger'.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc64/kernel/setup.c

@@ -90,11 +90,6 @@ static struct console prom_early_console = {
 	.index =	-1,
 };
 
-/* XXX Implement this at some point... */
-void kernel_enter_debugger(void)
-{
-}
-
 /* 
  * Process kernel command line switches that are specific to the
  * SPARC or that require special low-level processing.