pci: dwc: pci-dra7xx: Make shutdown handler static

Define dra7xx_pcie_shutdown() as a static function as it is not used
in other compilation units.
Signed-off-by: Vignesh R <vigneshr@ti.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Keerthy <j-keerthy@ti.com>

drivers/pci/dwc/pci-dra7xx.c

@@ -810,7 +810,7 @@ static int dra7xx_pcie_resume_noirq(struct device *dev)
 }
 #endif
 
-void dra7xx_pcie_shutdown(struct platform_device *pdev)
+static void dra7xx_pcie_shutdown(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);