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/common/dfu.c b/common/dfu.c
index cd60f9a..d23cf67 100644
--- a/common/dfu.c
+++ b/common/dfu.c
@@ -12,6 +12,7 @@
 
 #include <common.h>
 #include <command.h>
+#include <log.h>
 #include <watchdog.h>
 #include <dfu.h>
 #include <console.h>