Convert SPI block erase to use the multicommand infrastructure

Tested-by: Jakob Bornecrantz <wallbraker@gmail.com>

Corresponding to flashrom svn r650.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>

Jakob writes:
Tested it on my EPIA-m700 and it worked nice. Also double checked that
one of the changed functions actually ran.
Acked-by: Jakob Bornecrantz <wallbraker@gmail.com>
1 file changed