Disintegrate asm/system.h for ARM

Disintegrate asm/system.h for ARM.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Russell King <linux@arm.linux.org.uk>
cc: linux-arm-kernel@lists.infradead.org
diff --git a/arch/arm/mm/idmap.c b/arch/arm/mm/idmap.c
index feacf4c..ab88ed4 100644
--- a/arch/arm/mm/idmap.c
+++ b/arch/arm/mm/idmap.c
@@ -5,6 +5,7 @@
 #include <asm/pgalloc.h>
 #include <asm/pgtable.h>
 #include <asm/sections.h>
+#include <asm/system_info.h>
 
 pgd_t *idmap_pgd;