ppc: Move cpu/$CPU to arch/ppc/cpu/$CPU

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/board/mbx8xx/u-boot.lds.debug b/board/mbx8xx/u-boot.lds.debug
index 4f179c7..61c0d68 100644
--- a/board/mbx8xx/u-boot.lds.debug
+++ b/board/mbx8xx/u-boot.lds.debug
@@ -55,7 +55,7 @@
     /* WARNING - the following is hand-optimized to fit within	*/
     /* the sector layout of our flash chips!	XXX FIXME XXX	*/
 
-    cpu/mpc8xx/start.o	(.text)
+    arch/ppc/cpu/mpc8xx/start.o	(.text)
     common/dlmalloc.o	(.text)
     lib/vsprintf.o	(.text)
     lib/crc32.o		(.text)