Update CONFIG_PCIAUTO_SKIP_HOST_BRIDGE to related boards

Remove test for CONFIG_MPC5200 in drivers/pci/pci_auto.c and define
CONFIG_PCIAUTO_SKIP_HOST_BRIDGE in related board configuration files.

Signed-off-by: TsiChung Liew <Tsi-Chung.Liew@freescale.com>
diff --git a/include/configs/IceCube.h b/include/configs/IceCube.h
index 9b485a9..38a0226 100644
--- a/include/configs/IceCube.h
+++ b/include/configs/IceCube.h
@@ -56,6 +56,7 @@
 #if defined(CONFIG_PCI)
 #define CONFIG_PCI_PNP		1
 #define CONFIG_PCI_SCAN_SHOW	1
+#define CONFIG_PCIAUTO_SKIP_HOST_BRIDGE	1
 
 #define CONFIG_PCI_MEM_BUS	0x40000000
 #define CONFIG_PCI_MEM_PHYS	CONFIG_PCI_MEM_BUS