drm/amdgpu: Use new TTM flag to avoid OOM triggering.

Avoid OOM on syatem pages allocations.

v2:
Remove modeprobe parameter, make this behaviour the only option.

v3:
Move setting no_retry flag into amdgpu_ttm_init.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1387,6 +1387,10 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
 		return r;
 	}
 	adev->mman.initialized = true;
+
+	/* We opt to avoid OOM on system pages allocations */
+	adev->mman.bdev.no_retry = true;
+
 	r = ttm_bo_init_mm(&adev->mman.bdev, TTM_PL_VRAM,
 				adev->gmc.real_vram_size >> PAGE_SHIFT);
 	if (r) {