[S] Change in coreboot[main]: src/soc/intel/common: Add Intel RMT+ support in DEV mode

[Arthur Heymans (Code Review)]

Attention is currently required from: Anil Kumar K, Bora Guvendik, Cliff Huang, Gaggery Tsai, Jamie Ryu, Jérémy Compostella, Kane Chen, Karthik Ramasubramanian, Krishna P Bhat D, Pratikkumar V Prajapati, Ravishankar Sarawadi, Ronak Kanabar, Subrata Banik, V Sowmya, Wonkyu Kim.

Arthur Heymans has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/77904?usp=email )

Change subject: src/soc/intel/common: Add Intel RMT+ support in DEV mode
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Patch Set 7:

(2 comments)

File src/soc/intel/common/block/memory/Kconfig:

https://review.coreboot.org/c/coreboot/+/77904/comment/4e6a1b68_02f52575 :
PS7, Line 33: depends on VBOOT
> > Needs it to query boot mode.
>
> Where in the code? I don't find + it compiles just fine without VBOOT. You're not passing CI in follow-up patches since you have a select on !VBOOT setups too.

vboot_developer_mode_enabled always return 0 on !VBOOT.

File src/soc/intel/common/block/memory/meminit.c:

https://review.coreboot.org/c/coreboot/+/77904/comment/5ab56c27_866a7da6 :
PS7, Line 228: vboot_developer_mode_enabled()
> Only enables this RMT+ feature with DEV mode since it will increase about 8% of boot time.

And non-vboot users? Is it desirable to never have RMT+ in that use case?