drm/amdkfd: Don't use sw fault filter if retry cam enabled

If retry cam enabled, we don't use sw retry fault filter and add fault
into sw filter ring, so we shouldn't remove fault from sw filter.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>