Change in flashrom[master]: ichspi: Extract handling programmer param into a function

[Nico Huber (Code Review)]

Attention is currently required from: Edward O'Callaghan, Angel Pons, Anastasia Klimchuk, Nikolai Artemiev.
Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/58736 )

Change subject: ichspi: Extract handling programmer param into a function
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Patch Set 1: Code-Review+2

(3 comments)

Patchset:

PS1: 
Tested with Panther Point (7 series PCH).

File ichspi.c:

https://review.coreboot.org/c/flashrom/+/58736/comment/106d0bc0_59cbe342 
PS1, Line 1760: *arg
Could be `*const arg`.

https://review.coreboot.org/c/flashrom/+/58736/comment/38374209_19f2ee28 
PS1, Line 1776: 			 arg);
Line break :)