Change in coreboot[master]: soc/intel/denverton_ns: enable Denverton to use common SoC SPI code

[Mariusz Szafrański (Code Review)]

Attention is currently required from: Jeff Daly, Suresh Bellampalli, Patrick Rudolph.
Mariusz Szafrański has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/61014 )

Change subject: soc/intel/denverton_ns: enable Denverton to use common SoC SPI code
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Patch Set 10: Code-Review+2