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ddi_device_copy() copies bytecount bytes from the source address, src_addr, to the destination address, dest_addr.
The attributes encoded in the access handles, src_handle and dest_handle, govern how data is actually copied from the source to the destination. Only matching
data sizes between the source and destination are supported.
Data will automatically be translated to maintain a consistent view between the source and the destination. The translation may involve byte-swapping if the source and the destination devices have
incompatible endian characteristics.
The src_advcnt and dest_advcnt arguments specifies the number of dev_datasz units to advance with each access to the device
addresses. A value of 0 will use the same source and destination device address on every access. A positive value increments the corresponding device address by certain number of data
size units in the next access. On the other hand, a negative value decrements the device address.
The dev_datasz argument determines the size of the data word on each access. The data size must be the same between the source and destination.
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