[coreboot] AMD cache setup is broken

[Arne Georg Gleditsch]

Arne Georg Gleditsch <arne.gleditsch at numascale.com> writes:
> I can confirm that this removes the earlier observed delays for me.
> Obviously, this is AMD-specific code that needs to be hooked in in a
> proper manner, but this definately seems to be the culprit.

Apparently, it's not crucial to clear this at the exact moment we switch
to using ram, so something like the appended is perhaps more
appropriate.  Confirmed to work on hw.

Signed-off-by: Arne Georg Gleditsch <arne.gleditsch at numscale.com>

-- 
							Arne.
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