kerneldoc: stdio: tmpl: Add stdio template

Add STDIO documentation template.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tom Rini <trini@ti.com>
[trini: Fix DOCBOOKS line as we don't have linker_lists yet]
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/doc/DocBook/Makefile b/doc/DocBook/Makefile
index 2f2ddfc..7f38444 100644
--- a/doc/DocBook/Makefile
+++ b/doc/DocBook/Makefile
@@ -8,7 +8,7 @@
 
 include $(TOPDIR)/config.mk
 
-DOCBOOKS :=
+DOCBOOKS := stdio.xml
 
 ###
 # The build process is as follows (targets):