Description of problem:
Kernel build fails if CONFIG_RHEL_DIFFERENCES is disabled.

Version-Release number of selected component (if applicable):
kernel-5.14.0-42.el9

How reproducible:
Always

Steps to Reproduce:
1. Change the CONFIG_RHEL_DIFFERENCES option from =y to 'not set'
2. Build the kernel
3.

Actual results:
Fails with errors

ld: arch/x86/xen/pci-swiotlb-xen.o: in function `pci_hw_disabled':
/home/yagi2/rpmbuild/kernel/55/BUILD/kernel-5.14.0-55.el9/linux-5.14.0-55.noRD.el9.x86_64/./include/linux/pci.h:1468: multiple definition of `pci_hw_disabled'; arch/x86/events/amd/ibs.o:/home/yagi2/rpmbuild/kernel/55/BUILD/kernel-5.14.0-55.el9/linux-5.14.0-55.noRD.el9.x86_64/./include/linux/pci.h:1468: first defined here
  (and many more lines)

Expected results:
Build succeeds.

Additional info:

pci_hw_disabled is defined twice, one in include/linux/pci.h and another in drivers/pci/pci-driver.c.

(1) include/linux/pci.h has this:

#ifdef CONFIG_RHEL_DIFFERENCES
const struct pci_device_id *pci_hw_deprecated(const struct pci_device_id *ids,
                                              struct pci_dev *dev);
const struct pci_device_id *pci_hw_unmaintained(const struct pci_device_id *ids,
                                                struct pci_dev *dev);
const struct pci_device_id *pci_hw_disabled(const struct pci_device_id *ids,
                                            struct pci_dev *dev);
#else
static inline const struct pci_device_id *pci_hw_deprecated(const struct pci_device_id *ids,
                                                            struct pci_dev *dev) { return NULL; }
static inline const struct pci_device_id *pci_hw_unmaintained(const struct pci_device_id *ids,
                                                              struct pci_dev *dev) { return NULL; }
const struct pci_device_id *pci_hw_disabled(const struct pci_device_id *ids,
                                            struct pci_dev *dev) {return NULL; }
#endif

(2) drivers/pci/pci-driver.c has:

const struct pci_device_id *pci_hw_disabled(const struct pci_device_id *ids,
                                            struct pci_dev *dev)
{
        const struct pci_device_id *ret = pci_match_id(ids, dev);

        if (!ret)
                return NULL;

        mark_hardware_disabled(dev_driver_string(&dev->dev), "%04X:%04X @ %s",
                                   dev->device, dev->vendor, pci_name(dev));
        return ret;
}
EXPORT_SYMBOL(pci_hw_disabled);