[M] Change in coreboot[master]: src: Add and use POST_BOOTBLOCK_C_ENTRY

[Martin L Roth (Code Review)]

Attention is currently required from: Raul Rangel, Jeff Daly, Matt DeVillier, Jonathan Zhang, Arthur Heymans, Jason Glenesk, Sean Rhodes, Tarun Tuli, Subrata Banik, Johnny Lin, Kapil Porwal, Christian Walter, Vanessa Eusebio, Lean Sheng Tan, Werner Zeh, Fred Reitberger, Felix Held, Tim Chu.

Martin L Roth has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/71593 )

Change subject: src: Add and use POST_BOOTBLOCK_C_ENTRY
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Patch Set 1:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/71593/comment/175c6768_d17dde35 
PS1, Line 9:
> nit: One extra space.

This is actually what I was taught in typing class back in the 80s.  The standard has changed over time, but it's a hard habit to break.

Fixed.

Patchset:

PS1:
> Can you add to the commit message that this notification is implemented as a new Post Code?

Done