Change in coreboot[master]: soc/intel/{xeon-sp,icl,tgl,jsl,ehl}: add NMI_{EN,STS} registers

[Lance Zhao (Code Review)]

Attention is currently required from: Arthur Heymans,  Felix Singer, Nico Huber, Johnny Lin, Christian Walter, Jingle Hsu, Michael Niewöhner, Morgan Jang, Maxim Polyakov.
Lance Zhao has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/48102 )

Change subject: soc/intel/{xeon-sp,icl,tgl,jsl,ehl}: add NMI_{EN,STS} registers
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Patch Set 22: Code-Review+2