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

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/board/siemens/pcu_e/u-boot.lds b/board/siemens/pcu_e/u-boot.lds
index cc8ad7d..ff2f566 100644
--- a/board/siemens/pcu_e/u-boot.lds
+++ b/board/siemens/pcu_e/u-boot.lds
@@ -52,7 +52,7 @@
   .plt : { *(.plt) }
   .text      :
   {
-    cpu/mpc8xx/start.o	(.text)
+    arch/ppc/cpu/mpc8xx/start.o	(.text)
     common/env_embedded.o(.text)
     *(.text)
     *(.got1)