sh: add init member to pci_channel data

This patch adds an init callback to struct pci_channel and makes sure
it is initialized properly. Code is added to call this init function
from pcibios_init(). Return values are adjusted and a warning is is
printed if init fails.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/include/asm/pci.h

@@ -17,11 +17,13 @@
  * external) PCI controllers.
  */
 struct pci_channel {
+	int (*init)(struct pci_channel *chan);
 	struct pci_ops *pci_ops;
 	struct resource *io_resource;
 	struct resource *mem_resource;
 	int first_devfn;
 	int last_devfn;
+	int enabled;
 };
 
 /*