ichspi.c: warn user and disable writes when a protected address range is detected.

This includes not only the notorious read-only flash descriptors and locked ME
regions, but also the more rarely used PRs (Protected Ranges).
The user can enforce write support by specifying ich_spi_force=yes in the
programmer options, but we don't tell him the exact syntax interactively. He
has to read it up in the man page.

Signed-off-by: Stefan Tauner <stefan.tauner@student.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>

git-svn-id: https://code.coreboot.org/svn/flashrom/trunk@1494 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

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