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/dfu/dfu_nand.c b/drivers/dfu/dfu_nand.c
index 58b9434..b8d24d2 100644
--- a/drivers/dfu/dfu_nand.c
+++ b/drivers/dfu/dfu_nand.c
@@ -10,6 +10,7 @@
  */
 
 #include <common.h>
+#include <log.h>
 #include <malloc.h>
 #include <errno.h>
 #include <div64.h>