PCI: Make pci_get_rom_size() static

pci_get_rom_size() is called only from pci_map_rom(), so it can be static.
Make it static and remove the declaration from include/linux/pci.h.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/rom.c

@@ -80,7 +80,8 @@ EXPORT_SYMBOL_GPL(pci_disable_rom);
  * The PCI window size could be much larger than the
  * actual image size.
  */
-size_t pci_get_rom_size(struct pci_dev *pdev, void __iomem *rom, size_t size)
+static size_t pci_get_rom_size(struct pci_dev *pdev, void __iomem *rom,
+			       size_t size)
 {
 	void __iomem *image;
 	int last_image;

include/linux/pci.h

@@ -1122,7 +1122,6 @@ int pci_enable_rom(struct pci_dev *pdev);
 void pci_disable_rom(struct pci_dev *pdev);
 void __iomem __must_check *pci_map_rom(struct pci_dev *pdev, size_t *size);
 void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom);
-size_t pci_get_rom_size(struct pci_dev *pdev, void __iomem *rom, size_t size);
 void __iomem __must_check *pci_platform_rom(struct pci_dev *pdev, size_t *size);
 
 /* Power management related routines */