Add HE capability IE parsing support to get NSS supported for
scan entry. Curreny only vht capability ie pasing suuport ie
is there. But in case of 6GHz band vht capability IE ont be
there and thus giving false NSS as 1.
Change-Id: Ie25d67d765c0880ed82df0b6cc2d047fe08adec0
CRs-Fixed: 2744234