PCI: Remove pci_get_legacy_ide_irq() and asm-generic/pci.h

pci_get_legacy_ide_irq() is only used on platforms that support PNP, so
many architectures define it but never use it.  Replace uses of it with
ATA_PRIMARY_IRQ() and ATA_SECONDARY_IRQ(), which provide the same
functionality.

Since pci_get_legacy_ide_irq() is no longer used, remove all the
architecture-specific definitions of it as well as asm-generic/pci.h, which
only provides pci_get_legacy_ide_irq()

[bhelgaas: commit log]
Co-developed-by: Arnd Bergmann <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Stafford Horne <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Acked-by: Geert Uytterhoeven <[email protected]>
Acked-by: Pierre Morel <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>

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