85xx: Introduce CONFIG_SYS_PCI*_MEM_VIRT for FSL boards

Introduce a new define to seperate out the virtual address that PCI
memory is at from the physical address.  In most situations these are
mapped 1:1.  However any code accessing the bus should use VIRT.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Andy Fleming <afleming@freescale.com>
diff --git a/board/freescale/mpc8572ds/mpc8572ds.c b/board/freescale/mpc8572ds/mpc8572ds.c
index 5148d33..e57f9ff 100644
--- a/board/freescale/mpc8572ds/mpc8572ds.c
+++ b/board/freescale/mpc8572ds/mpc8572ds.c
@@ -215,7 +215,7 @@
 
 			pci_hose_read_config_dword(hose, PCI_BDF(2, 0x1d, 0 ),
 					PCI_BASE_ADDRESS_1, &temp32);
-			if (temp32 >= CONFIG_SYS_PCIE3_MEM_PHYS) {
+			if (temp32 >= CONFIG_SYS_PCIE3_MEM_BUS) {
 				debug(" uli1572 read to %x\n", temp32);
 				in_be32((unsigned *)temp32);
 			}