video: Fix up hp6xx driver build regressions.

This is some more fallout from the header reorganization, fix up the
paths accordingly.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/drivers/video/backlight/hp680_bl.c b/drivers/video/backlight/hp680_bl.c
index fbea2bd..6fa0b9d 100644
--- a/drivers/video/backlight/hp680_bl.c
+++ b/drivers/video/backlight/hp680_bl.c
@@ -18,7 +18,7 @@
 #include <linux/fb.h>
 #include <linux/backlight.h>
 
-#include <asm/cpu/dac.h>
+#include <cpu/dac.h>
 #include <asm/hp6xx.h>
 #include <asm/hd64461.h>