drm/amdgpu/powerplay: include asm/div64.h for do_div()

Fixes: 1e4854e96c35 ("drm/amdgpu/powerplay: implement thermal control for tonga.")
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/fiji_thermal.c b/drivers/gpu/drm/amd/powerplay/hwmgr/fiji_thermal.c
index def57d0..e76a7de 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/fiji_thermal.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/fiji_thermal.c
@@ -20,7 +20,7 @@
  * OTHER DEALINGS IN THE SOFTWARE.
  *
  */
-
+#include <asm/div64.h>
 #include "fiji_thermal.h"
 #include "fiji_hwmgr.h"
 #include "fiji_smumgr.h"
diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_thermal.c b/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_thermal.c
index 2e159b0..a188174 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_thermal.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_thermal.c
@@ -20,7 +20,7 @@
  * OTHER DEALINGS IN THE SOFTWARE.
  *
  */
-
+#include <asm/div64.h>
 #include "tonga_thermal.h"
 #include "tonga_hwmgr.h"
 #include "tonga_smumgr.h"