dmaengine: idxd: remove fault processing code

mainline inclusion
from mainline-v5.15
commit 0e96454c
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I596WO


CVE: NA

Intel-SIG: commit 0e96454c dmaengine: idxd: remove fault processing code.
Incremental backporting patches for DSA/IAA on Intel Xeon platform.

--------------------------------

Kernel memory are pinned and will not cause faults. Since the driver
does not support interrupts for user descriptors, no fault errors are
expected to come through the misc interrupt. Remove dead code.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162630502789.631986.10591230961790023856.stgit@djiang5-desk3.ch.intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>