Fix erase for SST49LF020A

The chip supports multiple erase functions, but the function we use has
an eraseblock size of 4k.

Corresponding to flashrom svn r664.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
1 file changed