PCI: imx6: Convert to NOIRQ_SYSTEM_SLEEP_PM_OPS()

Replace SET_NOIRQ_SYSTEM_SLEEP_PM_OPS() with NOIRQ_SYSTEM_SLEEP_PM_OPS(),
which has the advantage that the compiler always sees the PM callbacks as
referenced, so they don't need to be wrapped with "#ifdef CONFIG_PM_SLEEP"
or tagged with "__maybe_unused" to avoid "defined but not used" warnings.

See 1a3c7bb0 ("PM: core: Add new *_PM_OPS macros, deprecate old ones").
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

drivers/pci/controller/dwc/pci-imx6.c

@@ -884,7 +884,6 @@ static const struct dw_pcie_ops dw_pcie_ops = {
 	.start_link = imx6_pcie_start_link,
 };
 
-#ifdef CONFIG_PM_SLEEP
 static void imx6_pcie_ltssm_disable(struct device *dev)
 {
 	struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
@@ -1008,10 +1007,9 @@ static int imx6_pcie_resume_noirq(struct device *dev)
 
 	return 0;
 }
-#endif
 
 static const struct dev_pm_ops imx6_pcie_pm_ops = {
-	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx6_pcie_suspend_noirq,
+	NOIRQ_SYSTEM_SLEEP_PM_OPS(imx6_pcie_suspend_noirq,
 				  imx6_pcie_resume_noirq)
 };