drm/amdgpu/gmc10: add sienna_cichlid support

Same as navi10.
Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -712,6 +712,7 @@ static int gmc_v10_0_mc_init(struct amdgpu_device *adev)
 		case CHIP_NAVI10:
 		case CHIP_NAVI14:
 		case CHIP_NAVI12:
+		case CHIP_SIENNA_CICHLID:
 		default:
 			adev->gmc.gart_size = 512ULL << 20;
 			break;
@@ -798,6 +799,7 @@ static int gmc_v10_0_sw_init(void *handle)
 	case CHIP_NAVI10:
 	case CHIP_NAVI14:
 	case CHIP_NAVI12:
+	case CHIP_SIENNA_CICHLID:
 		adev->num_vmhubs = 2;
 		/*
 		 * To fulfill 4-level page support,
@@ -896,6 +898,7 @@ static void gmc_v10_0_init_golden_registers(struct amdgpu_device *adev)
 	case CHIP_NAVI10:
 	case CHIP_NAVI14:
 	case CHIP_NAVI12:
+	case CHIP_SIENNA_CICHLID:
 		break;
 	default:
 		break;