Change in coreboot[master]: Rename MMCONF Kconfigs to ECAM_MMCONF

[Martin Roth (Code Review)]

Attention is currently required from: Raul Rangel, Mariusz Szafrański, Jonathan Zhang, Paul Menzel, Stefan Reinauer, Kyösti Mälkki, Andrey Petrov, Patrick Rudolph, Nico Huber, Anjaneya "Reddy" Chagam, Johnny Lin, Suresh Bellampalli, Morgan Jang, Michal Motyl, Alexander Couzens, Felix Held, Shelley Chen, Furquan Shaikh, Angel Pons, Lance Zhao, Jason Glenesk, Damien Zammit, Lee Leahy, Marshall Dawson, Vanessa Eusebio, Huang Jin.
Martin Roth has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/57333 )

Change subject: Rename MMCONF Kconfigs to ECAM_MMCONF
......................................................................

Patch Set 3:

(3 comments)

File src/device/Kconfig:

https://review.coreboot.org/c/coreboot/+/57333/comment/a904178e_2a2f00a2 
PS3, Line 502: NO_ECAM_MMCONF_SUPPORT
Maybe add some help text to this and the config below explaining what ECAM_MMCONF is?  Basically just what you have in the commit message.

The ECAM_MMCONF support uses the Enhanced Configuration Access mechanism (ECAM)
  method for accessing PCI config space.  This method is specific to x86 platforms.

Other platforms, such as ARM, use a different way of mapping the PCI config
  space to memory.

https://review.coreboot.org/c/coreboot/+/57333/comment/9b5c7ac0_52c87a97 
PS3, Line 504: 	default n
default y if !x86 ?

https://review.coreboot.org/c/coreboot/+/57333/comment/8946e2ca_ff53ddcd 
PS3, Line 506: ECAM_MMCONF_SUPPORT
Make this depend on X86?