qcacld-3.0: Ignore unsafe channel
Driver reports unsafe channel to the upper layer although
channel is unsafe.
Ignore the channels which are unsafe after examination
of whether channel is safe or not by the use of
policy_mgr_is_safe_channel() and report safe channel
to upper layer
Change-Id: Idfe741d19b8641814888938eab37a1daa83b7dd9
CRs-Fixed: 3197317