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- Check for read/write protected regions first.
- Region protection is write-once according to the data sheets. Check if
the write succeeded. Don't write if the region is not protected.
- Verbose region protection dumping.
- Improve readability of BAR mapping code.
- Align BAR mapping to a page boundary (4k) instead of a 16k boundary.

This patch prepares the code for a SPI detection heuristic.

Corresponding to flashrom svn r463.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Peter Stuge <peter@stuge.se>