SAP: Use sap_server instead of sap_connection as key for drivers
SAP: Use sap_server instead of sap_connection as key for drivers

This is a preparation for fixing SAP server when multiple adapters are
present. This is to avoid having extra pointer from sap_connection to
its sap_server struture. Only one connection per server is allowed
anyway so using sap_server as key is safe.

pstglia/external-bluetooth-bluez,ComputeCycles/bluez,pstglia/external-bluetooth-bluez,ComputeCycles/bluez,pstglia/external-bluetooth-bluez,silent-snowman/bluez,pkarasev3/bluez,mapfau/bluez,mapfau/bluez,silent-snowman/bluez,pstglia/external-bluetooth-bluez,silent-snowman/bluez,mapfau/bluez,pkarasev3/bluez,pkarasev3/bluez,ComputeCycles/bluez,ComputeCycles/bluez,silent-snowman/bluez,pkarasev3/bluez,mapfau/bluez