drm/amdgpu: skip sdma1 in nv_allowed_read_registers list for van gogh (v2)

Van gogh only has one sdma.

v2: use num_instances rather than APU flag
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -254,7 +254,8 @@ static int nv_read_register(struct amdgpu_device *adev, u32 se_num,
 	*value = 0;
 	for (i = 0; i < ARRAY_SIZE(nv_allowed_read_registers); i++) {
 		en = &nv_allowed_read_registers[i];
-		if (reg_offset !=
+		if ((i == 7 && (adev->sdma.num_instances == 1)) || /* some asics don't have SDMA1 */
+		    reg_offset !=
 		    (adev->reg_offset[en->hwip][en->inst][en->seg] + en->reg_offset))
 			continue;