mlx4: Clean IRQ affinity hint when freeing it

mlx4: Clean IRQ affinity hint when freeing it

This is done to avoid kernel's warning when affinty hint
of IRQ is set, when free_irq is called.

WARNING: at kernel/irq/manage.c:1002 __free_irq+0x22d/0x250()
Call Trace:
 [<ffffffff81071e27>] ? warn_slowpath_common+0x87/0xc0
 [<ffffffff81071e7a>] ? warn_slowpath_null+0x1a/0x20
 [<ffffffff810e83fd>] ? __free_irq+0x22d/0x250
 [<ffffffff810e848e>] ? free_irq+0x4e/0xb0
 [<ffffffffa03d083d>] ? mlx4_release_eq+0x9d/0xc0 [mlx4_core]

Signed-off-by: Ido Shamay <idos@mellanox.com>
(Ported from Mellanox OFED 2.4)

Signed-off-by: Mukesh Kacker <mukesh.kacker@oracle.com>