serial: 8250: convert drivers to use up_to_u8250p()
up_to_u8250p() casts struct uart_port * to struct uart_8250_port *. Update code to use it instead of open coded variant. Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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