gianfar: Make all BD status writes 32-bit
Whenever we want to update the status field in a BD, we usually want to update the length field, too. By combining them into one 32-bit field, we reduce the number of stores to memory shared with the controller, and we eliminate the need for order-enforcement, as the length and "READY" bit are now updated atomically at the same time. Signed-off-by: NDai Haruki <Dai.Haruki@freescale.com> Signed-off-by: NAndy Fleming <afleming@freescale.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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