The "KT" serial port has another use case for a "received break" quirk,
so before adding another special case to the 8250 core take this
opportunity to push such quirks out of the core and into a uart_port op.

Stephen says:
"If the callback function is to no longer live in 8250.c itself,
arch/arm/mach-tegra/devices.c isn't logically a good place to put it,
and that file will be going away once we get rid of all the board files
and move solely to device tree."

...so since 8250_pci.c houses all the quirks for pci serial devices this
quirk is similarly housed in of_serial.c. Once the open firmware
conversion completes the infrastructure details
(include/linux/of_serial.h, and the export) can all be removed to make
this self contained to of_serial.c.

Cc: Nhan H Mai
Cc: Colin Cross
Cc: Olof Johansson
[stephen: kill CONFIG_SERIAL_TEGRA in favor just using CONFIG_ARCH_TEGRA]
Cc: Grant Likely
Acked-by: Arnd Bergmann
Acked-by: Sudhakar Mamillapalli
Reported-by: Alan Cox
Acked-by: Alan Cox
Signed-off-by: Dan Williams
Acked-by: Stephen Warren
Tested-by: Stephen Warren
Signed-off-by: Greg Kroah-Hartman