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/net/eth_legacy.c b/net/eth_legacy.c
index 9d40f86..35f8d39 100644
--- a/net/eth_legacy.c
+++ b/net/eth_legacy.c
@@ -12,6 +12,7 @@
 #include <log.h>
 #include <net.h>
 #include <phy.h>
+#include <linux/bug.h>
 #include <linux/errno.h>
 #include <net/pcap.h>
 #include "eth_internal.h"