atapi_dmadir: why do we not (also) auto-detect it from IDENTIFY PACKET ??

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Albert / Jeff,

Way back in 2.6.17-rc2, you guys signed-off on 95de719adc94392a95c3c4d0a2d6b8b1ea39d236,
which added a libata module parameter for atapi_dmadir.

That's nice, but many modern drives (or bridge chips) flag this in
their IDENTIFY PACKET response, as bit-15 of word-62 of the returned data.

So for those at lease, we should be automatically setting atapi_dmadir=1.
But on a per-device basis, not globally as done now.

Albert: do you want to cook up a bug fix for this?

Cheers
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