The change I3d49c72a31d142ef3b14b439af2ae4cd8be059ea adds support
to append the vendor IEs received from userspace to assoc request.
But this also fixes a memleak in mbo IE handling. It's better split
these two as the feature(appending vendor IEs to assoc request)
may not be needed on all branches but the memleak fix is needed on
all the builds which support MBO.
So, revert this change and raise these as two separate changes.
Change-Id: Ia6423bb43b2ac294541c2485f5ed45d14af6553d
CRs-Fixed: 2851356
92da7db8e6