qcacmn: Add API to check Do Not Break Stream eligibility

1) Adds new policy mgr API 'policy_mgr_is_chan_ok_for_dnbs' to check
if a channel is OK for "Do Not Break Stream".
It means that if Do_Not_Switch_Channel is set for AP/GO vdev,
the channel passed should be either the AP/GO channel or a channel
from the other band.
2) Adds a new function policy_mgr_get_mode_specific_conn_info() to get
the mode specific connection count.

Change-Id: I4da6f7d56d01b01761a5f3557b8acbb84226a6fd
CRs-Fixed: 2037302
5 files changed