drm/amdgpu: Remove redundant reference of header file

Remove redundant reference of header file dev_printk.h
Signed-off-by: Ma Jun <Jun.Ma2@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/psp_v13_0.c

@@ -20,7 +20,6 @@
  * OTHER DEALINGS IN THE SOFTWARE.
  *
  */
-#include <linux/dev_printk.h>
 #include <drm/drm_drv.h>
 #include "amdgpu.h"
 #include "amdgpu_psp.h"