[POWERPC] 4xx: PCI-E Link setup improvements

This improves the way the 4xx PCI-E code handles checking for a link
and adds explicit testing of CRS result codes on config space accesses.

This should make it more reliable.

Also, bridges with no link are now still created, though config space
accesses beyond the root complex are filtered. This is one step toward
eventually supporting hotplug.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

arch/powerpc/sysdev/ppc4xx_pci.h

@@ -330,6 +330,8 @@
 /*
  * Config space register offsets
  */
+#define PECFG_ECRTCTL		0x074
+
 #define PECFG_BAR0LMPA		0x210
 #define PECFG_BAR0HMPA		0x214
 #define PECFG_BAR1MPA		0x218