drm/amdgpu: id reset count only is updated when used end v2

before that, we have function to check if reset happens by using reset count.
v2: always update reset count after vm flush

Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>