[flashrom-gerrit] Change in flashrom[master]: dummyflasher.c: Move 'spi_write_256_chunksize' into emu_data

[Angel Pons (Code Review)]

Attention is currently required from: Namyoon Woo, Edward O'Callaghan.
Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/54721 )

Change subject: dummyflasher.c: Move 'spi_write_256_chunksize' into emu_data
......................................................................

Patch Set 2:

(1 comment)

File dummyflasher.c:

https://review.coreboot.org/c/flashrom/+/54721/comment/e1d2699a_03a3bf00 
PS2, Line 713: 		data->spi_write_256_chunksize = atoi(tmp);
For another patch: This can result in overflow because `spi_write_256_chunksize` is of an unsigned type.