Change in coreboot[master]: soc/amd/common/apob: Add support for asynchronously reading APOB

[Raul Rangel (Code Review)]

Attention is currently required from: Jason Glenesk, Marshall Dawson, Felix Held.
Hello build bot (Jenkins), Jason Glenesk, Marshall Dawson, Felix Held,

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

https://review.coreboot.org/c/coreboot/+/55858

to look at the new patch set (#3).

Change subject: soc/amd/common/apob: Add support for asynchronously reading APOB
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soc/amd/common/apob: Add support for asynchronously reading APOB

This CL adds a method that can starts the processes of reading the APOB
from SPI. It does take more RAM in romstage since we no longer mmap the
buffer in the async happy path. This will allow us to reduce our boot
time by 10ms.

We don't register the future with the executor since it's not currently
getting called in romstage, and the transfer completes in a single
transaction.

BUG=b:179699789
TEST=With this and the FSP patch above I can see a 10 ms reduction in
boot time on guybrush.

Signed-off-by: Raul E Rangel 
Change-Id: I930d58b76eb4558bc4f48ed928c4d6538fefbde7
---
M src/soc/amd/common/block/apob/apob_cache.c
M src/soc/amd/common/block/include/amdblocks/apob_cache.h
2 files changed, 33 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/58/55858/3