[coreboot] SST25VF016B (2MB) flash on m57sli (IT8716F).

[Ronald Hoogenboom]

OK, I've checked it again and fixed a few things, see the read function
and the erase also has the block protect disable, and it works again.

It takes just under a minute to flash the whole chip, which is still
quite acceptable, I would say. It took WAY longer when the byte write
was timed by usleep instead of the myusec_delay.

Are there any more chips that need the block protect disable?
Are these block protect bits always at the same position in the status
register?

Signed-off-by: Ronald Hoogenboom <hoogenboom30 at zonnet.nl>

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