serial: 8250_dw: Don't use UPF_FIXED_TYPE
Allow 8250.c to determine the port type for us. This allows the driver take advantage of FIFO on Designware UARTs that have it. Signed-off-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com> Reviewed-by: NJamie Iles <jamie@jamieiles.com> Acked-by: NAlan Cox <alan@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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