powerpc/85xx: disable IDE subsystem in stx_gp3_defconfig

This patch disables deprecated IDE subsystem in stx_gp3_defconfig
(no IDE host drivers are selected in this config so there is no valid
reason to enable IDE subsystem itself).

Cc: Scott Wood <oss@buserror.net>
Cc: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Scott Wood <oss@buserror.net>

arch/powerpc/configs/85xx/stx_gp3_defconfig

@@ -31,8 +31,6 @@ CONFIG_BLK_DEV_LOOP=m
 CONFIG_BLK_DEV_NBD=m
 CONFIG_BLK_DEV_RAM=y
 CONFIG_BLK_DEV_RAM_SIZE=32768
-CONFIG_IDE=y
-CONFIG_BLK_DEV_IDECD=m
 CONFIG_SCSI=m
 CONFIG_BLK_DEV_SD=m
 CONFIG_CHR_DEV_ST=m