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/common/iotrace.c b/common/iotrace.c
index 295ee07..7225ee4 100644
--- a/common/iotrace.c
+++ b/common/iotrace.c
@@ -9,6 +9,7 @@
 #include <mapmem.h>
 #include <time.h>
 #include <asm/io.h>
+#include <linux/bug.h>
 #include <u-boot/crc.h>
 
 DECLARE_GLOBAL_DATA_PTR;