TCQ code is host independent so remove redundant ide_dma_queued_* ops from
ide_hwif_t.  If we ever decide to bring back TCQ support this will fix OOPS
in ide-disk driver with CONFIG_BLK_DEV_IDE_TCQ_DEFAULT=y and icside/sgiioc4
host drivers (it will also enable TCQ support for these host drivers).

Acked by Jens.