Disintegrate asm/system.h for Tile

Disintegrate asm/system.h for Tile.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Chris Metcalf <cmetcalf@tilera.com>
diff --git a/arch/tile/kernel/regs_32.S b/arch/tile/kernel/regs_32.S
index caa1310..c12280c 100644
--- a/arch/tile/kernel/regs_32.S
+++ b/arch/tile/kernel/regs_32.S
@@ -13,11 +13,11 @@
  */
 
 #include <linux/linkage.h>
-#include <asm/system.h>
 #include <asm/ptrace.h>
 #include <asm/asm-offsets.h>
 #include <arch/spr_def.h>
 #include <asm/processor.h>
+#include <asm/switch_to.h>
 
 /*
  * See <asm/system.h>; called with prev and next task_struct pointers.