mtd-utils: nandwrite: Use libmtd to get correct mtd parameters

mtd-utils: nandwrite: Use libmtd to get correct mtd parameters

Begin utilizing libmtd for MTD operations: use mtd_get_dev_info() to return
a more detailed set of information about our MTD. Most importantly, libmtd
will yield a 64-bit "size" parameter. This is necessary to properly detect
devices larer than 4GB.

printf() arguments needed reformatted for the new mtd_dev_info data types.
In addition, the printf() was restructured to keep lines shorter.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>