Duet3D/DuetSoftwareFramework

Add emulation of M409 to add support for USB drives when PanelDue is attached

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At present, M409 is entirely handled by RRF. DSF needs to emulate it as well in order to provide SBC-only OM fields (like volumes or network in SBC mode).

PanelDue sets the number of available SD cards (volumes) by checking the size of the volumes key. This menas DSF needs to handle M409 so that the correct number of volumes is returned.

Already implemented by e264ae2.