Refactor queue allocation and initialization into a wdc_alloc_queue()

function, and let attachment code calls this rather than malloc(9).
This prevents re-initialization of the queue in shared queue chipsets.
Also, add wdc_free_queue() as a complementary function.

Earlier version (without wdc_free_queue()) tested by sthen@ and Amit
Kulkarni on various pciide(4) chips.

ok dlg@

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