tty: serial: add Freescale lpuart driver support

* Freescale low power universal asynchronous receiver/transmitter (lpuart)

Required properties:

- compatible : Should be "fsl,<soc>-lpuart"

- reg : Address and length of the register set for the device

- interrupts : Should contain uart interrupt

Example:

uart0: serial@40027000 {

	       compatible = "fsl,vf610-lpuart";

	       reg = <0x40027000 0x1000>;

	       interrupts = <0 61 0x00>;

       };

	  If multiple cards are present, the default limit of 32 ports may

	  need to be increased.

config SERIAL_FSL_LPUART

	tristate "Freescale lpuart serial port support"

	select SERIAL_CORE

	help

	  Support for the on-chip lpuart on some Freescale SOCs.

config SERIAL_FSL_LPUART_CONSOLE

	bool "Console on Freescale lpuart serial port"

	depends on SERIAL_FSL_LPUART=y

	select SERIAL_CORE_CONSOLE

	help

	  If you have enabled the lpuart serial port on the Freescale SoCs,

	  you can make it the console by answering Y to this option.

endmenu

endif # TTY

obj-$(CONFIG_SERIAL_EFM32_UART) += efm32-uart.o

obj-$(CONFIG_SERIAL_ARC)	+= arc_uart.o

obj-$(CONFIG_SERIAL_RP2)	+= rp2.o

obj-$(CONFIG_SERIAL_FSL_LPUART)	+= fsl_lpuart.o

/* Rocketport EXPRESS/INFINITY */

#define PORT_RP2	102

/* Freescale lpuart */

#define PORT_LPUART	103

#endif /* _UAPILINUX_SERIAL_CORE_H */