Change in flashrom[master]: spi25_statusreg.c: Allow opaque masters to hook spi_{rw}_register()

[Edward O'Callaghan (Code Review)]

Attention is currently required from: Nikolai Artemiev, Sergii Dmytruk.
Edward O'Callaghan has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/64375 )

Change subject: spi25_statusreg.c: Allow opaque masters to hook spi_{rw}_register()
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Patch Set 1:

(1 comment)

File include/programmer.h:

https://review.coreboot.org/c/flashrom/+/64375/comment/bd1ad185_bb1e2db8 
PS1, Line 409: 	int (*write_status) (const struct flashctx *flash, int status);
> +1, these should take a register argument and should also both return status codes. […]

Done. Regarding can_{rw}_register(), a ret<0 could indicate it is not supported by the backing master?