qcacld-3.0: Replace isRoamOffloadEnabled and RoamOffloadEnabled

Replace legacy isRoamOffloadEnabled from csr_config with
converged flag lfr3_roaming_offload.
Fix CamelCase issues for roam offload part.

Change-Id: I89ceda876d5549e9b0959e7e25e317c9667594b5
CRs-Fixed: 2367873
7 files changed