[coreboot] AMD HT link frequency limit configuration patch

[Timothy Pearson]

Here is a new patch that utilizes KConfig in expert mode.  Also, the HT
width is now configurable as well.

This patch is critical for the MSI MS-9652 mainboard and Barcelona CPUs;
without limiting the HT link the system was completely unstable due to bad
PCB layout.

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Signed-off-by: Timothy Pearson <tpearson at raptorengineeringinc.com>

Timothy Pearson
Raptor Engineering
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