[M] Change in flashrom[master]: drivers/: Make 'internal_delay' the default unless defined

[Edward O'Callaghan (Code Review)]

Attention is currently required from: Nico Huber, Angel Pons, Nikolai Artemiev.

Edward O'Callaghan has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/67391 )

Change subject: drivers/: Make 'internal_delay' the default unless defined
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Patch Set 3:

(1 comment)

Commit Message:

https://review.coreboot.org/c/flashrom/+/67391/comment/be07fd24_c6b55b55 
PS3, Line 13: and paves way
            : to remove the 'programmer' global handle.
> I can't connect the dots either. […]

Because 42 programmers had to dispatch `internal_delay()` via deference though `programmer->delay()` and now the dispatch to `internal_delay()` is direct under the condition of nullity. Therefore this decreases the overall cyclomatic complexity of the control flow graph of the `programmer` global handle.