[M] Change in coreboot[main]: include/spd_bin.h: Add SPD IO layer

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Attention is currently required from: Shuo Liu, [e-mail].

Hello Shuo Liu, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/84201?usp=email

to look at the new patch set (#4).

The following approvals got outdated and were removed:
Code-Review+1 by Shuo Liu, Verified+1 by build bot (Jenkins)

Change subject: include/spd_bin.h: Add SPD IO layer
......................................................................

include/spd_bin.h: Add SPD IO layer

By default, PCH SMBus codes will be called to retrieve SPD data. This
patch adds a SPD IO layer so that SoC could implement its specific SPD
IO layer functions such as using Integrated Memory Controller to get
SPD data.

Change-Id: I656298aeda409fca3c85266b5b8727fac9bfc917
Signed-off-by: Yuchi Chen 
---
M src/include/spd_bin.h
M src/soc/intel/common/block/smbus/Makefile.mk
M src/soc/intel/common/block/smbus/smbuslib.c
A src/soc/intel/common/block/smbus/spd_access.c
4 files changed, 40 insertions(+), 15 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/01/84201/4