MIPS: Loongson 3: Add serial port support

Loongson family machines has three types of serial port: PCI UART, LPC
UART and CPU internal UART. Loongson-2E and parts of Loongson-2F based
machines use PCI UART; most Loongson-2F based machines use LPC UART;
Loongson-2G/3A has both LPC and CPU UART but usually use CPU UART.

Port address of UARTs:
CPU UART: REG_BASE + OFFSET;
LPC UART: LIO1_BASE + OFFSET;
PCI UART: PCIIO_BASE + OFFSET.

Since LPC UART are linked in "Local Bus", both CPU UART and LPC UART
are called "CPU provided serial port".

Signed-off-by: Huacai Chen <[email protected]>
Signed-off-by: Hongliang Tao <[email protected]>
Signed-off-by: Hua Yan <[email protected]>
Tested-by: Alex Smith <[email protected]>
Reviewed-by: Alex Smith <[email protected]>
Cc: John Crispin <[email protected]>
Cc: Steven J. Hill <[email protected]>
Cc: Aurelien Jarno <[email protected]>
Cc: [email protected]
Cc: Fuxin Zhang <[email protected]>
Cc: Zhangjin Wu <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/6635
Signed-off-by: Ralf Baechle <[email protected]>

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