Currently wmi_roam_event_id event handler only register under feature
WLAN_FEATURE_ROAM_OFFLOAD, but it's needed for LFR2 roaming too. So
refine roam event processing for LFR2/LFR3.
Change-Id: Ic07fd8a543142fc1e151f484979ab99ff55ce802
CRs-Fixed: 3161973