Declare machine-info as embedded on target images

hostnamectl determines the chassis type in different ways depending on whether we are running on laptop, pc, VM, container or target hardware. This guess is not predictable.

Bluez set the class of device from the chassis type. On a laptop or desktop chassis, BlueZ will automatically set the Bluetooth Class of Device to "Laptop" or "Desktop" and this is overwriting value configured in /etc/bluetooth/main.conf.

Let's statically configure the chassis type to "embedded" to avoid any guess.

Signed-off-by: Frédéric Dalleau frederic.dalleau@collabora.com