V4L/DVB (5385): Fix compilation issue with zr364xx when V4L1 is disabled

Add a missing header to fix compilation issue in the zr364xx driver when
CONFIG_VIDEO_V4L1 and CONFIG_VIDEO_V4L1_COMPAT are not set.

Signed-off-by: Antoine Jacquet <royale@zerezo.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/zr364xx.c

@@ -33,6 +33,7 @@
 #include <linux/vmalloc.h>
 #include <linux/slab.h>
 #include <linux/proc_fs.h>
+#include <linux/highmem.h>
 #include <media/v4l2-common.h>