mtd: remove the ixp2000 map driver

This driver depends on CONFIG_IXP2000 which is not defined anywhere, which
means this driver is dead.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --cc drivers/mtd/maps/Kconfig
Simple merge

diff --cc drivers/mtd/maps/Makefile
Simple merge

diff --cc drivers/mtd/maps/ixp2000.c
Simple merge