Disintegrate asm/system.h for PowerPC

Disintegrate asm/system.h for PowerPC.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
cc: linuxppc-dev@lists.ozlabs.org
diff --git a/lib/raid6/altivec.uc b/lib/raid6/altivec.uc
index 2654d5c..69f3a9f 100644
--- a/lib/raid6/altivec.uc
+++ b/lib/raid6/altivec.uc
@@ -30,6 +30,7 @@
 #ifdef __KERNEL__
 # include <asm/system.h>
 # include <asm/cputable.h>
+# include <asm/switch_to.h>
 #endif
 
 /*