BTM_RegForEScoEvts() function

* Function BTM_RegForEScoEvts * Description This function registers a SCO event callback with the * specified instance. It should be used to received * connection indication events and change of link parameter * events. * Returns BTM_SUCCESS if the successful. * BTM_ILLEGAL_VALUE if there is an illegal sco_inx * BTM_MODE_UNSUPPORTED if controller version is not BT1.2 or * later or does not support eSCO.