common: Drop linux/bug.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/armltd/integrator/pci.c b/board/armltd/integrator/pci.c
index e3793c1..3ef5993 100644
--- a/board/armltd/integrator/pci.c
+++ b/board/armltd/integrator/pci.c
@@ -24,6 +24,7 @@
 #include <log.h>
 #include <pci.h>
 #include <asm/io.h>
+#include <linux/bug.h>
 #include "integrator-sc.h"
 #include "pci_v3.h"