qcacld-3.0: Reset roaming_in_progress when ROAM_HO_FAILED is received

Currently, roaming_in_progress is set during ROAM_START event from
firmware and reset after ROAM_SYNC_COMPLETE or ROAM_ABORT event.
But there can be a scenario that firmware sends ROAM_START event
followed by ROAM_HO_FAILED event which indicates that roaming is
failed to host, so roaming_in_progress flag needs to be reset at
ROAM_HO_FAILED otherwise subsequent data path related configuration
and stats request from userspace will fail as they will assume
that roaming is in progress.

Change-Id: I413359a9152de11c56125192931ab446a0dd4727
CRs-Fixed: 3308567