[SPARC64] sunhv: Bug fixes.

Add udelay to polling console write loop, and increment
the loop limit.

Name the device "ttyHV" and pass that to add_preferred_console()
when we're using hypervisor console.

Kill sunhv_console_setup(), it's empty.

Handle the case where we don't want to use hypervisor console.
(ie. we have a head attached to a sun4v machine)

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

arch/sparc64/kernel/setup.c

@@ -410,6 +410,7 @@ static int __init set_preferred_console(void)
 		 * value anyways...
 		 */
 		serial_console = 4;
+		return add_preferred_console("ttyHV", 0, NULL);
 	} else {
 		prom_printf("Inconsistent console: "
 			    "input %d, output %d\n",