Add NVME block device support and userspace utilities

Signed-off-by: Mamatha Inamdar <mamatha4@linux.vnet.ibm.com>
[stewart@linux.vnet.ibm.com: update buildroot with backported nvme utility
and put CONFIG_BLK_DEV_NVME in correct place in skiroot_defconfig]
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 d3ac61d..06fbd7c 100644
--- a/openpower/configs/linux/skiroot_defconfig
+++ b/openpower/configs/linux/skiroot_defconfig
@@ -20,6 +20,7 @@
 CONFIG_LOG_BUF_SHIFT=20
 CONFIG_RELAY=y
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_BLK_DEV_NVME=y
 # CONFIG_RD_GZIP is not set
 # CONFIG_RD_BZIP2 is not set
 # CONFIG_RD_LZMA is not set