[PATCH] Use layout for write/verify (for 0.9.7) (unstable)

[Vasiliy Vylegzhanin]

Adpoted patch from http://patchwork.coreboot.org/user/bundle/37/ for
layout support for read ops and new code for verify. Doesn't read
whole chip when writing regions, useful when some regions are locked
(e.g. ME).

DO NOT USE UNLESS YOU KNOW WHAT YOU ARE DOING

If flashrom can't erase desired blocks for some reason, it can erase
the whole chip.