Add debug output to programmer_map_flash_region().

While we don't expect addresses with more than 32 bits here, let's
print the whole possible range for debugging anyway.

Signed-off-by: Stefan Tauner <stefan.tauner@student.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@student.tuwien.ac.at>

git-svn-id: svn://flashrom.org/flashrom/trunk@1743 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1