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

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/board/eric/eric.c b/board/eric/eric.c
index cfcfa52..96c0b83 100644
--- a/board/eric/eric.c
+++ b/board/eric/eric.c
@@ -132,7 +132,7 @@
 	/*
 	 * ToDo: Move the asm init routine sdram_init() to this C file,
 	 * or even better use some common ppc4xx code available
-	 * in cpu/ppc4xx
+	 * in arch/ppc/cpu/ppc4xx
 	 */
 	sdram_init();