Merge changes I51c3b864,I2af0f2c2,Ifaec802b,I9ea573cb,I87154d64, ...

* changes:
  what on earth
  if you pass 0, these are the values used
  These were never set
  The params are never ignore, they're set in this function
  Fold bt_scan_mode_t into BTA_DmSetVisibility
  Flatten BTA_DmSetVisibility