[coreboot-gerrit] Change in coreboot[master]: nb/intel/haswell: Use common {DMI,EP,MCH}BAR accessors

[Angel Pons (Code Review)]

Attention is currently required from: Nico Huber, Patrick Rudolph.
Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/49749 )

Change subject: nb/intel/haswell: Use common {DMI,EP,MCH}BAR accessors
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Patch Set 4:

(1 comment)

File src/northbridge/intel/haswell/haswell.h:

https://review.coreboot.org/c/coreboot/+/49749/comment/03f683b4_0b869fcf 
PS4, Line 64: EPBAR64
> Is the reason for keeping those here, that older Intel NB don't have any EP/DMI 64bit registers?

I kept these here because other northbridges don't use them, and I'm not sure if 64-bit register accesses would work properly on all northbridges (I know they work on Haswell, but no idea about others).