IB/iser: Move PI context alloc/free to routines
IB/iser: Move PI context alloc/free to routines

Make iser_[create|destroy]_fastreg_desc shorter, more
readable and easily extendable.

This patch does not change any functionality.

Signed-off-by: Sagi Grimberg <380ce2a82d3d08e67ab163b51dc6d30288ad3f13@mellanox.com>
Signed-off-by: Adir Lev <4b223e769211519bac08a17081dc0a2f80023130@mellanox.com>
Signed-off-by: Doug Ledford <f35204f44eabfe97bbcdd18aee9e9fffc59f29e1@redhat.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs