configs/linux/skiroot_defconfig: trim kernel defconfig for P8

There are a few drivers for adapters that aren't seen or supported
by anyone, so they can safely go.

Also, CIFS and NFS have both never been supported by petitboot, and
add non-trivial amount of rootfs usage, remove them.

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
diff --git a/openpower/configs/linux/skiroot_defconfig b/openpower/configs/linux/skiroot_defconfig
index c0c6bad..6a75e08 100644
--- a/openpower/configs/linux/skiroot_defconfig
+++ b/openpower/configs/linux/skiroot_defconfig
@@ -72,7 +72,6 @@
 CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_DEV_RAM=y
 CONFIG_BLK_DEV_RAM_SIZE=65536
-CONFIG_ATA_OVER_ETH=m
 CONFIG_VIRTIO_BLK=m
 CONFIG_BLK_DEV_NVME=m
 CONFIG_EEPROM_AT24=y
@@ -95,8 +94,6 @@
 CONFIG_MEGARAID_MAILBOX=m
 CONFIG_MEGARAID_SAS=m
 CONFIG_SCSI_MPT2SAS=m
-CONFIG_SCSI_SYM53C8XX_2=y
-CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=0
 CONFIG_SCSI_IPR=m
 # CONFIG_SCSI_IPR_TRACE is not set
 # CONFIG_SCSI_IPR_DUMP is not set
@@ -127,10 +124,8 @@
 CONFIG_NETCONSOLE=m
 CONFIG_TUN=m
 CONFIG_VIRTIO_NET=m
-CONFIG_VORTEX=m
 CONFIG_ACENIC=m
 CONFIG_ACENIC_OMIT_TIGON_I=y
-CONFIG_PCNET32=m
 CONFIG_TIGON3=y
 CONFIG_BNX2X=m
 CONFIG_CHELSIO_T1=y
@@ -198,7 +193,6 @@
 CONFIG_XFS_POSIX_ACL=y
 CONFIG_BTRFS_FS=m
 CONFIG_BTRFS_FS_POSIX_ACL=y
-CONFIG_AUTOFS4_FS=m
 CONFIG_ISO9660_FS=m
 CONFIG_UDF_FS=m
 CONFIG_MSDOS_FS=m
@@ -206,11 +200,7 @@
 CONFIG_PROC_KCORE=y
 CONFIG_TMPFS=y
 CONFIG_TMPFS_POSIX_ACL=y
-CONFIG_NFS_FS=m
-CONFIG_NFS_V3_ACL=y
-CONFIG_NFS_V4=m
-CONFIG_CIFS=m
-# CONFIG_CIFS_DEBUG is not set
+# CONFIG_NETWORK_FILESYSTEMS is not set
 CONFIG_NLS_DEFAULT="utf8"
 CONFIG_NLS_CODEPAGE_437=y
 CONFIG_NLS_ASCII=y