iwlagn: Support new 1000 microcode.

iwlagn: Support new 1000 microcode.

New iwlwifi-1000 microcode requires driver support for API version 5.
(There is no version 4)

Signed-off-by: Don Fry <donald.h.fry@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>