can_emu: Delete macros for non-existing typedef

can_emu: Delete macros for non-existing typedef

CanBusClass doesn't exist.  This will break when we automatically
convert the code to use OBJECT_DEFINE_TYPE().  Delete the macros
that reference the non-existing typedef.

Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Daniel P. Berrangé <[email protected]>
Signed-off-by: Eduardo Habkost <[email protected]>
Tested-By: Roman Bolshakov <[email protected]>
Message-Id: <20200825192110.3528606[email protected]>
Signed-off-by: Eduardo Habkost <[email protected]>