Revert "uas: fix sdev->host->dma_dev"

Revert "uas: fix sdev->host->dma_dev"

This reverts commit 558033c2828f832ab3b68c6f8b8710e0de6faef0 as Hans
reports it causes problems on some systems.  Until a "real" fix for this
can be found, revert this change to get normal functionality back.

Link: https://lore.kernel.org/r/70ca74c2-4a80-e25b-eca9-a63a75516673@redhat.com
Cc: Tom Yan <tom.ty89@gmail.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>