Change in coreboot[master]: util/cbmem: Add FlameGraph-compatible timestamps output

[Jakub Czapiga (Code Review)]

Attention is currently required from: Jakub Czapiga, Tim Wawrzynczak, Alex Levin, Julius Werner, Jan Dabros.
Hello build bot (Jenkins), Tim Wawrzynczak, Alex Levin, Julius Werner, Jan Dabros,

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

https://review.coreboot.org/c/coreboot/+/62474

to look at the new patch set (#2).

Change subject: util/cbmem: Add FlameGraph-compatible timestamps output
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util/cbmem: Add FlameGraph-compatible timestamps output

Flame graphs are used to visualize hierarchical data, like call stacks.
Timestamps collected by coreboot can be processed to resemble
profiler-like output, and thus can be feed to flame graph generation
tools.

TEST=Run on coreboot-enabled device and extract timestamps using
     -t/-T/-S options

Signed-off-by: Jakub Czapiga 
Change-Id: I3a4e20a267e9e0fbc6b3a4d6a2409b32ce8fca33
---
M src/commonlib/include/commonlib/timestamp_serialized.h
M util/cbmem/cbmem.c
2 files changed, 368 insertions(+), 27 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/74/62474/2