linux-phytec-fsl

iwlwifi: mvm: enable IEEE80211_HW_SUPPORT_FAST_XMIT

Since the firmware is responsible for duration calculation, the
driver can easily support fast-xmit.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>