x86: Rename include/asm/ic to include/asm/arch-sc520

Also include some trivial related cleanups
diff --git a/board/eNET/eNET.c b/board/eNET/eNET.c
index 2a5636c..c4ed820 100644
--- a/board/eNET/eNET.c
+++ b/board/eNET/eNET.c
@@ -23,7 +23,7 @@
 
 #include <common.h>
 #include <asm/io.h>
-#include <asm/ic/sc520.h>
+#include <asm/arch/sc520.h>
 #include <net.h>
 #include <netdev.h>