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/fs/btrfs/super.c b/fs/btrfs/super.c
index f80c148..913a4d4 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -6,6 +6,7 @@
  */
 
 #include <common.h>
+#include <log.h>
 #include <memalign.h>
 #include <part.h>
 #include <linux/compat.h>