Change in coreboot[master]: lib/spd_bin: add get_spd_sn function

[Jamie Chen (Code Review)]

Hello build bot (Jenkins), Furquan Shaikh, Tim Wawrzynczak, Edward O'Callaghan, Angel Pons, Arthur Heymans, Kane Chen, Aaron Durbin, Patrick Rudolph,

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

https://review.coreboot.org/c/coreboot/+/40414

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

Change subject: lib/spd_bin: add get_spd_sn function
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lib/spd_bin: add get_spd_sn function

This patch adds the get_spd_sn function. It's for reading SODIMM serial
number. In spd_cache implementation it can use to get serial number
before reading whole SPD by smbus.

BUG=b:146457985
BRANCH=None
TEST=Wrote sample code to get the serial number and ran on puff.
     It can get the serial number correctly.

Change-Id: I406bba7cc56debbd9851d430f069e4fb96ec937c
Signed-off-by: Jamie Chen 
---
M src/include/spd_bin.h
M src/soc/intel/common/block/smbus/smbuslib.c
2 files changed, 47 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/14/40414/4