[SPARC64] sunhv: Support SYSRQ properly.

By calling uart_handle_break().  We'll still do the
"sun_do_break()" handling if the user gives two
breaks in a row.

We should probably do this in the other Sparc serial
drivers too.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/serial/sunhv.c

@@ -91,6 +91,8 @@ static struct tty_struct *receive_chars(struct uart_port *port, struct pt_regs *
 			break;
 
 		if (c == CON_BREAK) {
+			if (uart_handle_break(port))
+				continue;
 			saw_console_brk = 1;
 			c = 0;
 		}