serial: 8250_ingenic: support for Ingenic SoC UARTs

Introduce a driver suitable for use with the UARTs present in
Ingenic SoCs such as the JZ4740 & JZ4780. These are described as being
ns16550 compatible but aren't quite - they require the setting of an
extra bit in the FCR register to enable the UART module. The serial_out
implementation is the same as that in arch/mips/jz4740/serial.c - which
will shortly be removed.

Signed-off-by: Paul Burton <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Sebastian Andrzej Siewior <[email protected]>
Cc: Peter Hurley <[email protected]>
Cc: Alan Cox <[email protected]>
Cc: [email protected]
Cc: Matthias Brugger <[email protected]>
Cc: Ricardo Ribalda Delgado <[email protected]>
Cc: Tony Lindgren <[email protected]>
Cc: John Crispin <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/10159/
Signed-off-by: Ralf Baechle <[email protected]>

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