net: wireless: iwlegacy: fix build error for il_pm_ops

net: wireless: iwlegacy: fix build error for il_pm_ops

Fix build error for il_pm_ops if CONFIG_PM is set
but CONFIG_PM_SLEEP is not set.

ERROR: "il_pm_ops" [drivers/net/wireless/iwlegacy/iwl4965.ko] undefined!
ERROR: "il_pm_ops" [drivers/net/wireless/iwlegacy/iwl3945.ko] undefined!
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2

Signed-off-by: Yijing Wang <[email protected]>
Cc: Stanislaw Gruszka <[email protected]>
Cc: "John W. Linville" <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Jingoo Han <[email protected]>
Acked-by: Jingoo Han <[email protected]>
Signed-off-by: John W. Linville <[email protected]>