common: Drop linux/printk.h from common header

This old patch was marked as deferred. Bring it back to life, to continue
towards the removal of common.h

Move this out of the common header and include it only where needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/dfu/dfu.c b/drivers/dfu/dfu.c
index b2ee5f1..2adf26e 100644
--- a/drivers/dfu/dfu.c
+++ b/drivers/dfu/dfu.c
@@ -17,6 +17,7 @@
 #include <hash.h>
 #include <linux/list.h>
 #include <linux/compiler.h>
+#include <linux/printk.h>
 
 LIST_HEAD(dfu_list);
 static int dfu_alt_num;