drm/amdgpu: Remove duplicated includes

Remove duplicated includes in amdgpu_amdkfd_gpuvm.c and amdgpu_ttm.c.
Resolves checkincludes message.
Signed-off-by: GUO Zihua <guozihua@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -39,7 +39,6 @@
 #include "amdgpu_xgmi.h"
 #include "kfd_priv.h"
 #include "kfd_smi_events.h"
-#include <drm/ttm/ttm_tt.h>
 
 /* Userptr restore delay, just long enough to allow consecutive VM
  * changes to accumulate

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

@@ -49,7 +49,6 @@
 #include <drm/ttm/ttm_tt.h>
 
 #include <drm/amdgpu_drm.h>
-#include <drm/drm_drv.h>
 
 #include "amdgpu.h"
 #include "amdgpu_object.h"