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.c b/drivers/dfu/dfu.c
index df50196..a298c2c 100644
--- a/drivers/dfu/dfu.c
+++ b/drivers/dfu/dfu.c
@@ -9,6 +9,7 @@
 #include <common.h>
 #include <env.h>
 #include <errno.h>
+#include <log.h>
 #include <malloc.h>
 #include <mmc.h>
 #include <fat.h>