drivers: remove the SGI SN2 IOC4 base support

The IOC4 is a multi-function chip seen on SGI SN2 and some SGI MIPS
systems.  This removes the base driver, which while not having an SN2
Kconfig dependency was only for sub-drivers that had one.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lkml.kernel.org/r/20190813072514.23299-15-hch@lst.de
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/mips/configs/bigsur_defconfig

@@ -103,7 +103,6 @@ CONFIG_FW_LOADER=m
 CONFIG_BLK_DEV_LOOP=m
 CONFIG_BLK_DEV_CRYPTOLOOP=m
 CONFIG_BLK_DEV_NBD=m
-CONFIG_SGI_IOC4=m
 CONFIG_EEPROM_LEGACY=y
 CONFIG_EEPROM_MAX6875=y
 CONFIG_IDE=y

arch/mips/configs/ip32_defconfig

@@ -46,7 +46,6 @@ CONFIG_CONNECTOR=y
 CONFIG_BLK_DEV_LOOP=m
 CONFIG_BLK_DEV_CRYPTOLOOP=m
 CONFIG_BLK_DEV_NBD=m
-CONFIG_SGI_IOC4=y
 CONFIG_RAID_ATTRS=y
 CONFIG_SCSI=y
 CONFIG_BLK_DEV_SD=y

arch/mips/configs/markeins_defconfig

@@ -117,7 +117,6 @@ CONFIG_MTD_CFI_AMDSTD=y
 CONFIG_MTD_PHYSMAP=y
 CONFIG_BLK_DEV_LOOP=m
 CONFIG_BLK_DEV_CRYPTOLOOP=m
-CONFIG_SGI_IOC4=m
 CONFIG_SCSI=m
 # CONFIG_SCSI_PROC_FS is not set
 CONFIG_BLK_DEV_SD=m

arch/mips/configs/rm200_defconfig

@@ -198,7 +198,6 @@ CONFIG_BLK_DEV_SX8=m
 CONFIG_BLK_DEV_RAM=m
 CONFIG_CDROM_PKTCDVD=m
 CONFIG_ATA_OVER_ETH=m
-CONFIG_SGI_IOC4=m
 CONFIG_RAID_ATTRS=m
 CONFIG_SCSI=y
 CONFIG_BLK_DEV_SD=y

arch/mips/configs/sb1250_swarm_defconfig

@@ -49,7 +49,6 @@ CONFIG_BLK_DEV_RAM=y
 CONFIG_BLK_DEV_RAM_SIZE=9220
 CONFIG_CDROM_PKTCDVD=m
 CONFIG_ATA_OVER_ETH=m
-CONFIG_SGI_IOC4=m
 CONFIG_IDE=y
 CONFIG_BLK_DEV_IDECD=y
 CONFIG_BLK_DEV_IDETAPE=y