PCI: Call dma_debug_add_bus() for pci_bus_type from PCI core

There is nothing arch-specific about PCI or dma-debug, so call
dma_debug_add_bus() from the PCI core just after registering the bus type.

Most of dma-debug is already generic; this just adds reporting of pending
dma-allocations on driver unload for arches other than powerpc, sh, and
x86.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)

drivers/pci/pci-driver.c

@@ -1667,7 +1667,7 @@ static int __init pci_driver_init(void)
 	if (ret)
 		return ret;
 #endif
-
+	dma_debug_add_bus(&pci_bus_type);
 	return 0;
 }
 postcore_initcall(pci_driver_init);