This enhances the existing vendor command QCA_NL80211_VENDOR_SUBCMD_ROAM
with the following configurations:
1. Set/get/clear roam control
2. Set/get the channels on which the roaming has to be triggered
3. Set/get the roam scan period
4. Configure the triggers for roaming
5. Configure the candidate selection criteria
Change-Id: I75bad835c501d86fa4b2f0e8fcadf8af5b17daca
CRs-Fixed: 2508279
a75e44c100