qcacld-3.0: Implement temporary WAR for BT coex issue

Implement a WAR to address a BT coex issue, along with a private ioctl
which can be used to switch the WAR on or off dynamically.

Change-Id: I9d29c141106db479039789d67c45a455e96a118b
CRs-Fixed: 2383150
5 files changed