common: Drop log.h from common header

Move this header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/broadcom/bcmstb/bcmstb.c b/board/broadcom/bcmstb/bcmstb.c
index ee0cf8f..add4285 100644
--- a/board/broadcom/bcmstb/bcmstb.c
+++ b/board/broadcom/bcmstb/bcmstb.c
@@ -8,6 +8,7 @@
 
 #include <cpu_func.h>
 #include <init.h>
+#include <log.h>
 #include <time.h>
 #include <linux/types.h>
 #include <common.h>