Description of a Flash device. The description is meant
to explain what the Flash device and its purpose is.
Current values are:
System flash - for the primary Flash used to store full
system images.
Boot flash - for the secondary Flash used to store
bootstrap images.
The ciscoFlashDeviceDescr, ciscoFlashDeviceController
(if applicable), and ciscoFlashPhyEntIndex objects are
expected to collectively give all information about a
Flash device.
The device description will always be available for a
removable device, even when the device has been removed.