console: move console_init() out of tty_io.c

All the console driver handling code lives in printk.c.
Move console_init() there as well so console support can still be used
when the TTY code is configured out. No logical changes from this patch.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/include/linux/console.h b/include/linux/console.h
index 5949d18..b8920a0 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -212,4 +212,6 @@ extern bool vgacon_text_force(void);
 static inline bool vgacon_text_force(void) { return false; }
 #endif
 
+extern void console_init(void);
+
 #endif /* _LINUX_CONSOLE_H */