linux-phytec-fsl

mac80211: minstrel_ht: remove obsolete #if for >= 3 streams

This was added during early development when 3x3 hardware was not very
common yet. This is completely unnecessary now.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>