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

[Angel Pons (Code Review)]

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

Change subject: Rename MMCONF Kconfigs to ECAM_MMCONF
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Patch Set 3:

(4 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/57333/comment/7c1c6b9d_68cf3b80 
PS3, Line 11: This can be confusing as
            : other platforms, such as ARM, use a different way of mapping the pci
            : config space to memory.
Out of curiosity, which mechanism does ARM use?

File payloads/external/Makefile.inc:

https://review.coreboot.org/c/coreboot/+/57333/comment/bab8cf4f_04c16425 
PS3, Line 149: 		CONFIG_ECAM_MMCONF_BASE_ADDRESS=$(CONFIG_ECAM_MMCONF_BASE_ADDRESS) \
This change and the one in payloads/external/tianocore/Makefile.inc would prevent using any other MMCONF access methods with tianocore. Is this intentional?

File src/device/Kconfig:

https://review.coreboot.org/c/coreboot/+/57333/comment/78b77fba_c13c52fa 
PS3, Line 622: 	depends on (ECAM_MMCONF_SUPPORT || PCI_IO_CFG_EXT)
Does this specifically depend on ECAM, or just MMCONF?

https://review.coreboot.org/c/coreboot/+/57333/comment/d63562b4_7fe5c033 
PS3, Line 639: 	default 16 if ECAM_MMCONF_SUPPORT && ECAM_MMCONF_BUS_NUMBER <= 128
Same as above.