Merge changes I8ae73541,I4326718b

* changes:
  WifiHAL: Move Roaming API's to new file
  WifiHAL: Send stats only if radio and iface stats are available
tree: 1cbf674febf91ca3ad950ee0f2070d52b4fc96f1
  1. qcwcn/
  2. Android.mk