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/drivers/net/ks8851_mll.c b/drivers/net/ks8851_mll.c
index 718a7dd..8fcb63d 100644
--- a/drivers/net/ks8851_mll.c
+++ b/drivers/net/ks8851_mll.c
@@ -4,6 +4,7 @@
  * Copyright (c) 2011 Roberto Cerati <roberto.cerati@bticino.it>
  */
 
+#include <log.h>
 #include <asm/io.h>
 #include <common.h>
 #include <command.h>