Comment 0 for bug 1853990

"[Bug Description]
When smmu is enable, if execute the perftest command and then use 'kill
-9' to exit, follow this operation repeatedly, the kernel will have a high
probability to print the following smmu event:

  arm-smmu-v3 arm-smmu-v3.1.auto: event 0x10 received:
  arm-smmu-v3 arm-smmu-v3.1.auto: 0x00007d0000000010
  arm-smmu-v3 arm-smmu-v3.1.auto: 0x0000020900000080
  arm-smmu-v3 arm-smmu-v3.1.auto: 0x00000000f47cf000
  arm-smmu-v3 arm-smmu-v3.1.auto: 0x00000000f47cf000

This is because the hw will periodically refresh the qpc cache until the
next reset.

This patch fixed it by removing the action that release qpc memory in the
'hns_roce_qp_free' function.

[Steps to Reproduce]
1. load hns-roce-hw-v2.ko and open smmu
2. run rdma app
3. kill RoCE process

[Actual Results]
fail

[Expected Results]
success

[Reproducibility]
Inevitably

[Additional information]
Hardware: D06
Firmware: NA
Kernel: NA

[Resolution]
"RDMA/hns: Fixs hw access invalid dma memory error