mtd: remove the mbx860 map driver

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

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: linux-pcmcia@lists.infradead.org
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-m68k@lists.linux-m68k.org
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/mbx860.c
Simple merge