tile PCI RC: Use default pcibios_enable_device()

We don't need anything arch-specific in pcibios_enable_device(), so drop
the arch implementation and use the default generic one.

Note: pci_enable_resources() checks that r->parent is non-NULL, which
basically checks that pci_claim_resource() or request_resource() has been
called for each BAR.  I don't see where that happens for tile, but this
patch doesn't change that behavior, so if it worked before, it should still
work.
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NChris Metcalf <cmetcalf@tilera.com>

arch/tile/kernel/pci_gx.c

@@ -1064,18 +1064,6 @@ char *__init pcibios_setup(char *str)
 	return str;
 }
 
-/*
- * Enable memory address decoding, as appropriate, for the
- * device described by the 'dev' struct.
- *
- * This is called from the generic PCI layer, and can be called
- * for bridges or endpoints.
- */
-int pcibios_enable_device(struct pci_dev *dev, int mask)
-{
-	return pci_enable_resources(dev, mask);
-}
-
 /*
  * Called for each device after PCI setup is done.
  * We initialize the PCI device capabilities conservatively, assuming that