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, Eric Peers, Felix Held,

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

https://review.coreboot.org/c/coreboot/+/56232

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 require more RAM in ramstage since we no longer mmap
the buffer in the async happy path. This will allow us to reduce our
boot time by 10ms.

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

Signed-off-by: Raul E Rangel 
Change-Id: I930d58b76eb4558bc4f48ed928c4d6538fefb1e5
---
M src/soc/amd/common/block/apob/apob_cache.c
1 file changed, 68 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/32/56232/3