wl1251: add get_survey callback in order to get channel noise
Signed-off-by: John W. Linville <linville@tuxdriver.com> Acked-by: Kalle Valo <kvalo@adurom.com>
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Signed-off-by: John W. Linville <linville@tuxdriver.com> Acked-by: Kalle Valo <kvalo@adurom.com>