[coreboot] [patch] drop meaningless K8_4RANK_DIMM_SUPPORT define

[Jonathan A. Kollasch]

Don't define K8_4RANK_DIMM_SUPPORT, nothing uses it.
All these boards define QRANK_DIMM_SUPPORT anyway,
which is probably what was meant.

Signed-off-by: Jonathan Kollasch 
Acked-by: Jonathan Kollasch 
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