linux-phytec-fsl

mac80211: add device_timestamp to the drv_pre_channel_switch trace

The device_timestamp value was left out of the event trace for
drv_pre_channel_switch by mistake.  Add it.

Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>