serial: 8250_dw: don't set UPF_BOOT_AUTOCONF flag

serial8250_register_8250_port adds it to all ports it
registers. No need to set it separately.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>