ALSA: hda - Add missing inclusion of linux/export.h

This is needed newly since 3.2...

Signed-off-by: Takashi Iwai <[e-mail]>

sound/core/ctljack.c

···
  */
 
 #include <linux/kernel.h>
+#include <linux/export.h>
 #include <sound/core.h>
 #include <sound/control.h>
 

sound/pci/hda/hda_jack.c

···
 
 #include <linux/init.h>
 #include <linux/slab.h>
+#include <linux/export.h>
 #include <sound/core.h>
 #include <sound/control.h>
 #include <sound/jack.h>