qcacld-3.0: Add a check for WLM latency manager support

Currently there is no check for WLM latency manager support,
while setting the latency level which may lead to undefined behavior.
To address the above issue add a check for WLM latency manager support
and return not supported to userspace.

Change-Id: Id095f162c1202c0a0926f4f73e553f46d4980543
CRs-Fixed: 2762357