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

Also include some trivial related cleanups
diff --git a/arch/x86/cpu/sc520/sc520_sdram.c b/arch/x86/cpu/sc520/sc520_sdram.c
index f3623f5..57e4e7d 100644
--- a/arch/x86/cpu/sc520/sc520_sdram.c
+++ b/arch/x86/cpu/sc520/sc520_sdram.c
@@ -24,7 +24,7 @@
 #include <common.h>
 #include <asm/io.h>
 #include <asm/processor-flags.h>
-#include <asm/ic/sc520.h>
+#include <asm/arch/sc520.h>
 
 DECLARE_GLOBAL_DATA_PTR;