drm/amdgpu/sriov : Add sriov detection for sienna_cichlid

This is a regression due to the rebase , add sienna_cichlid sriov detection back
Signed-off-by: shaoyunl <shaoyun.liu@amd.com>
Reviewed-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/amdgpu_virt.c

@@ -321,6 +321,7 @@ void amdgpu_detect_virtualization(struct amdgpu_device *adev)
 	case CHIP_VEGA20:
 	case CHIP_NAVI10:
 	case CHIP_NAVI12:
+	case CHIP_SIENNA_CICHLID:
 	case CHIP_ARCTURUS:
 		reg = RREG32(mmRCC_IOV_FUNC_IDENTIFIER);
 		break;