ide: remove the sgiioc4 driver

The SGI SN2 support is about to be removed.  Remove this driver that
depends on the SN2 support.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lkml.kernel.org/r/20190813072514.23299-5-hch@lst.de
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/configs/generic_defconfig

@@ -51,7 +51,6 @@ CONFIG_BLK_DEV_IDECD=y
 CONFIG_BLK_DEV_GENERIC=y
 CONFIG_BLK_DEV_CMD64X=y
 CONFIG_BLK_DEV_PIIX=y
-CONFIG_BLK_DEV_SGIIOC4=y
 CONFIG_BLK_DEV_SD=y
 CONFIG_CHR_DEV_ST=m
 CONFIG_BLK_DEV_SR=m

arch/ia64/configs/gensparse_defconfig

@@ -44,7 +44,6 @@ CONFIG_IDE_GENERIC=y
 CONFIG_BLK_DEV_GENERIC=y
 CONFIG_BLK_DEV_CMD64X=y
 CONFIG_BLK_DEV_PIIX=y
-CONFIG_BLK_DEV_SGIIOC4=y
 CONFIG_SCSI=y
 CONFIG_BLK_DEV_SD=y
 CONFIG_CHR_DEV_ST=m