wil6210: sort IEs handling

sort overall IE's handling
prepare code (disabled for now) to add IEs for the beacon

Change-Id: I954ab92f6caab13354f81d8548ffced6052ce2a7
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Git-commit: cab5abbf9d0ef8b36d5f5181f0087ed3836385d0
Git-repo: https://github.com/kvalo/ath.git


Signed-off-by: Hamad Kadmany <hkadmany@codeaurora.org>