btio: Remove BT_IO_L2ERTM
btio: Remove BT_IO_L2ERTM

There's no need to have a separate type for ERTM. The mode parameter
takes care of most needs and if necessary a "reliable" parameter can be
added later which will map to SOCK_STREAM usage.

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