dmaengine: idxd: Remove unused struct idxd_fault

Since fault processing code has been removed, struct idxd_fault is not used any
more and can be removed as well.

Signed-off-by: Yuan Can <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/idxd/irq.c

···
 	IRQ_WORK_PROCESS_FAULT,
 };
 
-struct idxd_fault {
-	struct work_struct work;
-	u64 addr;
-	struct idxd_device *idxd;
-};
-
 struct idxd_resubmit {
 	struct work_struct work;
 	struct idxd_desc *desc;