iwlwifi: make TX seqno validation more efficient
Accessing the device in Tx path is not a good idea.
Mirror the data in DRAM.
Signed-off-by: 
Johannes Berg <johannes.berg@intel.com>
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Accessing the device in Tx path is not a good idea.
Mirror the data in DRAM.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>