emulator/bthost: Move smp_start to bthost_create
emulator/bthost: Move smp_start to bthost_create

This creates smp while creating bthost allowing for early bailout if
kernel doesn't support crypto. Fix crash if smp_start failed due to
SMP code always assuming valid pointer.

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