The ARM DCC serial port subtype is an option that is supported by the DBG2 generator. However, the serial port initialisation should only be done for PL011/SBSA compatible UARTs. Add check to conditionally initialise the serial port. Signed-off-by: Sami Mujawar <sami.mujawar@arm.com> Reviewed-by: Alexei Fedorov <Alexei.Fedorov@arm.com> Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>