[M] Change in coreboot[master]: drivers/intel/fsp2_0/memory_init: Inform user of memory training

[Tarun Tuli (Code Review)]

Attention is currently required from: Bora Guvendik, Zhixing Ma, Hannah Williams, Cliff Huang, Nico Huber, Michał Żygowski, Subrata Banik, Jérémy Compostella, Paul Menzel, Arthur Heymans, Nick Vaccaro, Andrey Petrov.

Tarun Tuli has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/70300 )

Change subject: drivers/intel/fsp2_0/memory_init: Inform user of memory training
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Patch Set 21:

(1 comment)

File src/drivers/intel/fsp2_0/memory_init.c:

https://review.coreboot.org/c/coreboot/+/70300/comment/58ad08ef_54181e38 
PS21, Line 283: if (!arch_upd->NvsBufferPtr)
> Hi Arthur […]

@Jeremy can you add some of the limitations/bug # tracking the improvements to your commit comment