powerpc/85xx:Fix lds for nand boot debug info

Currently "u-boot", the elf file generated via u-boot-nand.lds does not
contain required debug information i.e. .debug_{line, info, abbrev, aranges,
ranges} into their respective _global_ sections.

The original ld script line arch/powerpc/cpu/mpc85xx/start.o
KEEP(*(.bootpg)) is not entirely correct because the start.o file is already
processed by the linker,therefore the file wildcard in "KEEP(*(.bootpg))" will
not process start.o again for bootpg.

So Fix u-boot-nand.lds to generate these debug information.

Signed-off-by: Anmol Paralkar <b07584@freescale.com>
Signed-off-by: John Russo <John.Russo@freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>

arch/powerpc/cpu/mpc85xx/u-boot-nand.lds

@@ -1,5 +1,5 @@
 /*
- * Copyright 2009 Freescale Semiconductor, Inc.
+ * Copyright 2009-2012 Freescale Semiconductor, Inc.
  *
  * See file CREDITS for list of people who contributed to this
  * project.
@@ -87,7 +87,7 @@ SECTIONS
 
   .bootpg ADDR(.text) - 0x1000 :
   {
-    arch/powerpc/cpu/mpc85xx/start.o	KEEP(*(.bootpg))
+    KEEP(arch/powerpc/cpu/mpc85xx/start.o (.bootpg))
   } :text = 0xffff
 
   . = ADDR(.text) + 0x80000;