[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, 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.

Hello Anil Kumar K, 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, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/77904?usp=email

to look at the new patch set (#8).

The following approvals got outdated and were removed:
Verified+1 by build bot (Jenkins)

Change subject: src/soc/intel/common: Add Intel RMT+ support
......................................................................

src/soc/intel/common: Add Intel RMT+ support

This patch adds Intel RMT+ support for the DEV and normal mode. There
are two configuration:

1. SOC_INTEL_RMT_PLUS: enables this feature unconditionally.
 2. SOC_INTEL_RMT_PLUS_IN_DEV_MODE: only enables this feature with DEV
    mode.

The RMT+ feature introduces 8% overhead in the boot time if a memory training
is triggered, enabling this feature in DEV mode will not impact user
experience. Each platform should implement the enable_rmt_plus_platform
function if it is supported in the corresponding FSPM.

BUG=b:293441360
TEST=1. Add -DBDAT_SUPPORT=1 to build FSP packages.
     2. Enable SOC_INTEL_RMT_PLUS_IN_DEV_MODE flag with Rex.
     3. Flash the image on Rex and ensure BDAT ACPI table is
        available under /sys/firmware/acpi/tables/.

Change-Id: I03df4d0a927caa101da3db078b268dcdb4e78550
Signed-off-by: Gaggery Tsai 
---
M src/soc/intel/common/block/include/intelblocks/meminit.h
M src/soc/intel/common/block/memory/Kconfig
M src/soc/intel/common/block/memory/meminit.c
3 files changed, 41 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/04/77904/8