arm: lpda270_defconfig: disable IDE subsystem

This patch disables deprecated IDE subsystem in lpd270_defconfig
(no IDE host drivers are selected in this config so there is no
valid reason to enable IDE subsystem itself).

Cc: Daniel Mack <daniel@zonque.org>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>