[S] Change in flashrom[main]: Make sleep threshold for delays configurable

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Peter Marheine, Thomas Heijligen.

Anastasia Klimchuk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/81606?usp=email )

Change subject: Make sleep threshold for delays configurable
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Patch Set 4:

(2 comments)

File tests/udelay.c:

https://review.coreboot.org/c/flashrom/+/81606/comment/fa51b879_bd7bdbb4 :
PS2, Line 52: if (delay_us >= CONFIG_DELAY_MINIMUM_SLEEP_US)
> The test always takes at least as long to run as the chosen delay time, so 0. […]

I am now re-reading and don't understand myself what I was asking :D

File udelay_dos.c:

https://review.coreboot.org/c/flashrom/+/81606/comment/6bf73c6e_85bac27b :
PS4, Line 161: CONFIG_DELAY_MINIMUM_SLEEP_US
probably also needs the same `static const` trick?