serial: 8250_em: Use pseudo offset for UART_FCR

UART_FCR shares the same offset with UART_IIR. We cannot use UART_FCR
in serial8250_em_serial_in() as it overlaps with UART_IIR.

Define UART_FCR_EM macro with a high value to avoid overlapping
with existing UART_* register defines and define another macro
UART_FCR_EM_HW for the real offset.

Use these macros in serial8250_em_serial{_in/_out} function to
read/write FCR register.

Suggested-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Biju Das <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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