Change in flashrom[master]: sb600spi.c: Move sb600_spibar into spi data instead of being global

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Nico Huber, Edward O'Callaghan, Angel Pons.
Anastasia Klimchuk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/54712 )

Change subject: sb600spi.c: Move sb600_spibar into spi data instead of being global
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Patch Set 1:

(2 comments)

Patchset:

PS1: 
I have a message to reviewers, below. Thank you!

File sb600spi.c:

https://review.coreboot.org/c/flashrom/+/54712/comment/1a8e13df_4f8b9de9 
PS1, Line 610: free(data);
I am not quite sure whether I need to free sb600_data->sb600_spibar here. I wasn't freed before, and also it is mapped by rphysmap (not allocated).
But if it needs to be freed, I would better do this in this patch.