target: remove struct target_fabric_configfs_template

It's only embedded into struct target_fabric_configfs these days, so we
might as well remove this layer of abstraction.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --cc drivers/target/target_core_configfs.c
Simple merge

diff --cc drivers/target/target_core_fabric_configfs.c
Simple merge

diff --cc include/target/target_core_configfs.h
Simple merge