[flashrom-gerrit] Change in flashrom[master]: spi25: Integrate 4BA support

[David Hendricks (Code Review)]

David Hendricks has posted comments on this change. ( https://review.coreboot.org/22384 )

Change subject: spi25: Integrate 4BA support
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Patch Set 1:

I haven't gone thru this patch again (I suspect it's fine), but wanted to add response to your comment in 22020. The W25Q256FV is an example of a chip which supports:
- Native 4BA instructions
- Extended address register: 3BA commands used with a separate register to hold the most significant address byte.
- 4BA address mode: 3BA commands re-purposed to clock in 4 address bytes instead of 3.