cfg80211tool athX scanband <val> config is used to
select a specific band to scan (i.e., 2.4GHz and/or
5GHz). The initial support for this command was
added as an iwpriv for WEXT-based scanning through
IOCTL. However, on bringing up cfg80211 support,
support for not extended for the cfg80211-based
vendor scan.
Add support to ensure that this command will
control band configuration for scanning for cfg80211
vendor scanning.
CRs-Fixed: 2969914
Change-Id: Ie3b7140ea78f15533e73fbe6251e670e6faa6d29
6b048962f6