[S] Change in coreboot[master]: soc/intel/mtl/romstage: Insert EC boot timestamps

[Jay Patel (Code Review)]

Attention is currently required from: Bora Guvendik, Hannah Williams, Tarun Tuli, Jamie Ryu, Subrata Banik, Wonkyu Kim, Paul Menzel, Kapil Porwal.

Jay Patel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/73191 )

Change subject: soc/intel/mtl/romstage: Insert EC boot timestamps
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Patch Set 10:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/73191/comment/1416797c_a9b28798 
PS4, Line 9: Calls the function to insert EC boot timestamps to the coreboot
> can you add a sample snippet of cbmem -t output with these  timestamps? (somewhere in the patch trai […]

Added in the shared design doc mentioned in the bug.

File src/soc/intel/meteorlake/romstage/romstage.c:

https://review.coreboot.org/c/coreboot/+/73191/comment/3f226738_6e2d0379 
PS3, Line 142: insert_ec_event_timestamps();
> the function computes -ve timestamps based on SOC timer. […]

Ack