Change in coreboot[master]: soc/intel/common: Implement IOC driver

[Wonkyu Kim (Code Review)]

Attention is currently required from: Jamie Ryu, Subrata Banik, Ethan Tsao, Ravishankar Sarawadi, Tim Wawrzynczak, Angel Pons, Nick Vaccaro.
Wonkyu Kim has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/63198 )

Change subject: soc/intel/common: Implement IOC driver
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Patch Set 17:

(2 comments)

File src/soc/intel/common/block/ioc/ioc.c:

https://review.coreboot.org/c/coreboot/+/63198/comment/17e82843_5ddfa746 
PS17, Line 12: get_mchbar
> I would have written this logic as below […]

You mean move get_mchbar api in systemagent_early.c and implement set mch bar incase it's not enabled?

https://review.coreboot.org/c/coreboot/+/63198/comment/cc8bbfad_7b3826a7 
PS17, Line 16: if(
> if (

Ack