Split erase region walking out of erase_flash

That allows us to use erase region walking for a combined erase/write
action, and is a prerequisite for partial flashing,

Corresponding to flashrom svn r1077.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>
1 file changed