sbp-target: Initial merge of firewire/ieee-1394 target mode support

The FireWire SBP-2 Target is a driver for using an IEEE-1394 connection
as a SCSI transport. This module uses the SCSI Target framework to
expose LUNs to other machines attached to a FireWire bus, in effect
acting as a FireWire hard disk similar to FireWire Target Disk mode
on many Apple computers.

This commit contains the squashed pull from Chris Boot's SBP-2-Target:

      https://github.com/bootc/Linux-SBP-2-Target.git patch-v3

firewire-sbp-target: Add sbp_base.h header
firewire-sbp-target: Add sbp_configfs.c
firewire-sbp-target: Add sbp_fabric.{c,h}
firewire-sbp-target: Add sbp_management_agent.{c,h}
firewire-sbp-target: Add sbp_login.{c,h}
firewire-sbp-target: Add sbp_target_agent.{c,h}
firewire-sbp-target: Add sbp_scsi_cmnd.{c,h}
firewire-sbp-target: Add to target Kconfig and Makefile

Also add bootc's entry to the MAINTAINERS file.  Great work Chris !!

Signed-off-by: Chris Boot <bootc@bootc.net>
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: Andy Grover <agrover@redhat.com>
Cc: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/target/sbp/Kconfig b/drivers/target/sbp/Kconfig
new file mode 100644
index 0000000..132da54
--- /dev/null
+++ b/drivers/target/sbp/Kconfig
@@ -0,0 +1,11 @@
+config SBP_TARGET
+	tristate "FireWire SBP-2 fabric module"
+	depends on FIREWIRE && EXPERIMENTAL
+	help
+	  Say Y or M here to enable SCSI target functionality over FireWire.
+	  This enables you to expose SCSI devices to other nodes on the FireWire
+	  bus, for example hard disks. Similar to FireWire Target Disk mode on
+	  many Apple computers.
+
+	  To compile this driver as a module, say M here: The module will be
+	  called sbp-target.