Fix compile of hvc_rtas.c

Moving the struct definition out to the header had bad effect under one
ppc64 config that I tried:

drivers/char/hvc_console.h:59: error: field ‘kref’ has incomplete type

So move the include of kref.h too.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 drivers/char/hvc_console.c |    1 -
 drivers/char/hvc_console.h |    1 +
 2 files changed, 1 insertion(+), 1 deletion(-)

diff -r f382d8f562a8 drivers/char/hvc_console.c
--- a/drivers/char/hvc_console.c	Fri Jun 27 15:17:49 2008 +1000
+++ b/drivers/char/hvc_console.c	Fri Jun 27 15:24:15 2008 +1000
@@ -27,7 +27,6 @@
 #include <linux/init.h>
 #include <linux/kbd_kern.h>
 #include <linux/kernel.h>
-#include <linux/kref.h>
 #include <linux/kthread.h>
 #include <linux/list.h>
 #include <linux/module.h>
diff -r f382d8f562a8 drivers/char/hvc_console.h
--- a/drivers/char/hvc_console.h	Fri Jun 27 15:17:49 2008 +1000
+++ b/drivers/char/hvc_console.h	Fri Jun 27 15:24:15 2008 +1000
@@ -26,6 +26,7 @@
 
 #ifndef HVC_CONSOLE_H
 #define HVC_CONSOLE_H
+#include <linux/kref.h>
 
 /*
  * This is the max number of console adapters that can/will be found as