In stead of share one fault hash table per device, make it
per vm. This can avoid inter-process lock issue when fault
hash table is full.

Change-Id: I5d1281b7c41eddc8e26113e010516557588d3708
Signed-off-by: NOak Zeng <Oak.Zeng@amd.com>
Suggested-by: NChristian Konig <Christian.Koenig@amd.com>
Suggested-by: NFelix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: NChristian Konig <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>