u-boot: Enable PCI function and add PEX & rapidio memory map on MPC8548CDS board

Enable PCI function and add PEX & rapidio memory map on MPC8548CDS
board.
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
diff --git a/include/asm-ppc/mmu.h b/include/asm-ppc/mmu.h
index b226825..67c2c57 100644
--- a/include/asm-ppc/mmu.h
+++ b/include/asm-ppc/mmu.h
@@ -413,6 +413,7 @@
 #define LAWAR_TRGT_IF_PCI1	0x00000000
 #define LAWAR_TRGT_IF_PCIX	0x00000000
 #define LAWAR_TRGT_IF_PCI2	0x00100000
+#define LAWAR_TRGT_IF_PEX	0x00200000
 #define LAWAR_TRGT_IF_LBC	0x00400000
 #define LAWAR_TRGT_IF_CCSR	0x00800000
 #define LAWAR_TRGT_IF_DDR_INTERLEAVED 0x00B00000