drm/amdgpu: fix VCE ib alignment value

The VCE rings only require single dword alignment.

Signed-off-by: Alex Deucher <[e-mail]>

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

···
 			for (i = 0; i < AMDGPU_MAX_VCE_RINGS; i++)
 				ring_mask |= ((adev->vce.ring[i].ready ? 1 : 0) << i);
 			ib_start_alignment = AMDGPU_GPU_PAGE_SIZE;
-			ib_size_alignment = 8;
+			ib_size_alignment = 1;
 			break;
 		default:
 			return -EINVAL;