Change in coreboot[master]: util/cbmem: Rebase to handle negative timestamps

[Bora Guvendik (Code Review)]

Attention is currently required from: Selma Bensaid, Tim Wawrzynczak, Julius Werner.
Bora Guvendik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/59555 )

Change subject: util/cbmem: Rebase to handle negative timestamps
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Patch Set 5:

(1 comment)

File util/cbmem/cbmem.c:

https://review.coreboot.org/c/coreboot/+/59555/comment/c67b8eff_e7c1966d 
PS2, Line 665: 	/*
> No, I don't think you should need all this. […]

Thanks Julius for the explanation. It worked like you said, but I had to change it to prev_stamp = 0 instead of prev_stamp = sorted_tst_p->base_time;

3001 is a place holder for "CSME started executing"

3001:<unknown>                                         0
 944:CSE sent 'Boot Stall Done' to PMC                 296,000
 945:CSE started to handle ICC configuration           303,000 (7,000)
 946:CSE sent 'Host BIOS Prep Done' to PMC             308,000 (5,000)
 947:CSE received 'CPU Reset Done Ack sent' from PMC   1,074,000 (766,000)
   0:1st timestamp                                     1,162,757 (88,757)
  11:start of bootblock                                1,190,331 (27,573)