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

[Elyes Haouas (Code Review)]

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

Elyes Haouas 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 2:

(2 comments)

Patchset:

PS2: 
I'd let <console/console.h> chain-include <commonlib/console/post_codes.h>.
Please let me know your thoughts.

File src/soc/intel/skylake/bootblock/bootblock.c:

https://review.coreboot.org/c/coreboot/+/71593/comment/4cdea502_ae1500b9 
PS2, Line 4: <commonlib/console/post_codes.h>
<console/console.h> is needed for post_code() function