Add a --console-transport= option that selects between virtio-serial (the default, appearing as /dev/hvc0) and a regular serial port (appearing as /dev/ttyS0 or /dev/ttyAMA0 depending on architecture). This is primarily useful for testing purposes, for example to test sd-stub's automatic console= kernel command line parameter handling. It allows verifying that the guest OS correctly handles serial console configurations without virtio. When serial transport is selected, -serial chardev:console is used on the QEMU command line to connect the chardev to the platform's default serial device. This cannot be done via the QEMU config file as on some platforms (e.g. ARM) the serial device is a sysbus device that can only be connected via serial_hd() which is populated by -serial.
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