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/lib/libavb/avb_util.c b/lib/libavb/avb_util.c
index 94773b7..8719ede 100644
--- a/lib/libavb/avb_util.c
+++ b/lib/libavb/avb_util.c
@@ -4,6 +4,7 @@
  */
 
 #include "avb_util.h"
+#include <log.h>
 #include <malloc.h>
 
 #include <stdarg.h>