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

[Gaggery Tsai (Code Review)]

Attention is currently required from: Anil Kumar K, Arthur Heymans, Bora Guvendik, Cliff Huang, 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.

Gaggery Tsai 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
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Patch Set 8:

(3 comments)

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

https://review.coreboot.org/c/coreboot/+/77904/comment/ed30f586_26745ce0 :
PS7, Line 33: depends on VBOOT
> > > Needs it to query boot mode. […]

Done

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

https://review.coreboot.org/c/coreboot/+/77904/comment/cee45507_8ed95680 :
PS7, Line 221: __weak void enable_rmt_plus_platform(FSP_M_CONFIG *mem_cfg)
             : {
             : 	printk(BIOS_DEBUG, "RMT+ is not supported.\n");
             : }
> I will revise it.

Done

https://review.coreboot.org/c/coreboot/+/77904/comment/2154ba86_75187dc4 :
PS7, Line 228: vboot_developer_mode_enabled()
> > Only enables this RMT+ feature with DEV mode since it will increase about 8% of boot time. […]

Added another flag for DEV mode.