V4L/DVB (5819): Cleanup: reorder some includes

Some includes were added after some non-include macros, on old drivers.
Better to keep all includes at the beginning of the files. This change 
also helps to make backports to properly work at the development tree.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/bt8xx/bttvp.h b/drivers/media/video/bt8xx/bttvp.h
index 8f44f02..bd85f6d 100644
--- a/drivers/media/video/bt8xx/bttvp.h
+++ b/drivers/media/video/bt8xx/bttvp.h
@@ -33,12 +33,12 @@
 #include <linux/i2c.h>
 #include <linux/i2c-algo-bit.h>
 #include <linux/videodev.h>
-#include <media/v4l2-common.h>
 #include <linux/pci.h>
 #include <linux/input.h>
 #include <linux/mutex.h>
 #include <asm/scatterlist.h>
 #include <asm/io.h>
+#include <media/v4l2-common.h>
 
 #include <linux/device.h>
 #include <media/video-buf.h>