V4L/DVB (13167): pt1: Fix a compile error on arm

The lack of #include <linux/vmalloc.h> caused a compile error on some
architectures.
Signed-off-by: HIRANO Takahito <hiranotaka@zng.info>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/pt1/pt1.c

@@ -27,6 +27,7 @@
 #include <linux/pci.h>
 #include <linux/kthread.h>
 #include <linux/freezer.h>
+#include <linux/vmalloc.h>
 
 #include "dvbdev.h"
 #include "dvb_demux.h"