Patch merged into coreboot/master: AMD/bettong: Add UART support

the following patch was just integrated into master:
commit 22861385613e34a16ef745917f6956a92243d88b
Author: Zheng Bao 
Date:   Sat Nov 21 12:19:22 2015 +0800

AMD/bettong: Add UART support

The function delay in uart8250mem.c is not enough for hudson. I guess
    there are some problems in lapic_timer(). I uploaded a patch to gerrit
    to show the way to enable UART feature.
    http://review.coreboot.org/#/c/12343/4

Currently the HUDSON_UART is unchecked by default. Select HUDSON_UART to
    enable this feature.

The UART is test at BIOS stage.

Since it is not a standart UART device, the windows internal UART driver
    doesnt support it. I guess we need a driver to use it on windows.

Change-Id: I4cec833cc2ff8069c82886837f7cbd4483ff11bb
    Signed-off-by: Zheng Bao 
    Signed-off-by: Zheng Bao 
    Reviewed-on: http://review.coreboot.org/11749
    Tested-by: build bot (Jenkins)
    Reviewed-by: Aaron Durbin

See http://review.coreboot.org/11749 for details.

-gerrit