Add an API to iterate through all vdevs and check if any vdev is
in CAC in-progress state.
When DFS CAC is going on for SAP, if 5 GHz mac is occupied by the
SAP and it's not available for 5 GHz NAN discovery. Enabling NAN
on 5 GHz in such cases cause inconsistency in firmware state machine
and firmware may assert as DFS MAC is not supposed to be disturbed
while CAC is going on.
So, check if NAN enable request has 5 GHz NAN channel also and reject
the request. Allow NAN enable command if it's 2 GHz only NAN enable
request, while CAC is going on.
Change-Id: Idcd92e29d4b6078332d439efb75eba6800e986bb
CRs-Fixed: 3492054
c3a34a4987