Change in coreboot[master]: Documentation: add Intel Broadwell

[Angel Pons (Code Review)]

Attention is currently required from:  Felix Singer, Paul Menzel, Iru Cai, Iru Cai (vimacs).
Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/54744 )

Change subject: Documentation: add Intel Broadwell
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Patch Set 5:

(2 comments)

File Documentation/soc/intel/broadwell/blobs.md:

https://review.coreboot.org/c/coreboot/+/54744/comment/91a8ed07_cfdb82b3 
PS5, Line 31: of `refcode` is needed.
> The device does not work otherwise?

The refcode blob does PCIe/xHCI/SATA initialisation. One could boot without refcode, but many things won't work.

https://review.coreboot.org/c/coreboot/+/54744/comment/2e430bf0_9b884c20 
PS5, Line 39: Haswell
It doesn't support non-ULT Broadwell either.