y-Yi Guy <wey-yi.w.guy@intel.com> 1289411810 -0800
committer John W. Linville <linville@tuxdriver.com> 1289845619 -0500

iwlagn: enable shadow register

For 6000 series devices and up, enable automatic update MAC's register
for better power usage in PSP mode

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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