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_mmc.c b/drivers/dfu/dfu_mmc.c
index f583208..cdb3c18 100644
--- a/drivers/dfu/dfu_mmc.c
+++ b/drivers/dfu/dfu_mmc.c
@@ -17,6 +17,7 @@
 #include <mmc.h>
 #include <part.h>
 #include <command.h>
+#include <linux/printk.h>
 
 static unsigned char *dfu_file_buf;
 static u64 dfu_file_buf_len;