If CONFIG_PM_SLEEP is n, build fails:
drivers/clk/tegra/clk-tegra210.c:3426:13: error:
 tegra210_clk_suspend undeclared here (not in a function); did you mean tegra_clk_ndspeed?
  .suspend = tegra210_clk_suspend,
             ^~~~~~~~~~~~~~~~~~~~
             tegra_clk_ndspeed
drivers/clk/tegra/clk-tegra210.c:3427:12: error:
 tegra210_clk_resume undeclared here (not in a function); did you mean tegra210_clk_suspend?
  .resume = tegra210_clk_resume,
Use ifdef to guard this.
Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: 27d10d548c04 ("clk: tegra: Add suspend and resume support on Tegra210")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
 #endif
 
 static struct syscore_ops tegra_clk_syscore_ops = {
+#ifdef CONFIG_PM_SLEEP
        .suspend = tegra210_clk_suspend,
        .resume = tegra210_clk_resume,
+#endif
 };
 
 static struct tegra_cpu_car_ops tegra210_cpu_car_ops = {