percpu_ida: Removing unused arguement from alloc_local_tag

Removing unused struct percpu_ida *pool from arguements of
alloc_local_tag, changed it's one use in percpu_ida.c

(nab: Fixed reference of idr.c -> percpu_ida.c)

Signed-Off-By: Nick Swenson <nks@daterainc.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>