[ARM] pci: provide dummy pci_get_legacy_ide_irq()

This fixes footbridge_defconfig:

drivers/pnp/resource.c: In function 'pci_dev_uses_irq':
drivers/pnp/resource.c:317: error: implicit declaration of function 'pci_get_legacy_ide_irq'

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/include/asm-arm/pci.h b/include/asm-arm/pci.h
index 75feb15..2d84792 100644
--- a/include/asm-arm/pci.h
+++ b/include/asm-arm/pci.h
@@ -78,6 +78,14 @@
 	return root;
 }
 
+/*
+ * Dummy implementation; always return 0.
+ */
+static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
+{
+	return 0;
+}
+
 #endif /* __KERNEL__ */
  
 #endif