pata_via: Cache and rewrite the device bit
Some VIA chipsets will reset the DEV bit after IEN changes on ctl. Our optimised write path avoids doing this but we need to remove the optimisation on these devices. [Identified and some original patches proposed by Josehn Chan @ VIA but discussion then all ground to a halt so given a test case I dug it back out] Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk> Tested-by: Christoph Bisping (bug #13086) Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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