drm/amdgpu: remove table_freed param from the VM code

Better to leave the decision when to flush the VM changes in the TLB to
the VM code.

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