drm/amdgpu: Refine the error report when flush tlb.

there are 2 hubs to flush in the gmc, to make it easier
to debug when hub flush failed, refine the logs.
Signed-off-by: Peng Ju Zhou <PengJu.Zhou@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c

@@ -288,7 +288,7 @@ static void gmc_v10_0_flush_vm_hub(struct amdgpu_device *adev, uint32_t vmid,
 	if (i < adev->usec_timeout)
 		return;
 
-	DRM_ERROR("Timeout waiting for VM flush ACK!\n");
+	DRM_ERROR("Timeout waiting for VM flush hub: %d!\n", vmhub);
 }
 
 /**