target_core_alua: Store supported ALUA states

The supported ALUA states might be different for individual
devices, so store it in a separate field.

(nab: Remove unnecessary line continuation)

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

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

diff --cc drivers/target/target_core_alua.h
Simple merge

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