When SAP tries to come on 2.4 GHz channel with 40 MHz bandwidth
then it should start on same bandwidth if no other interface is
up. But currently SAP is getting switch from 40 MHz to 20 MHz
even in standalone case.
As a part of fix, check any other vdev is present on same mac or
not. If it's not present then start SAP on given bandwidth
Change-Id: Id9625a3dfaec34480f86b7ca1459ea33c32299fe
CRs-Fixed: 3226558
893081ff9e