video: Fix up hp6xx driver build regressions.

This is some more fallout from the header reorganization, fix up the
paths accordingly.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

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>
 

drivers/video/hitfb.c

@@ -27,7 +27,7 @@
 #include <asm/pgtable.h>
 #include <asm/io.h>
 #include <asm/hd64461.h>
-#include <asm/cpu/dac.h>
+#include <cpu/dac.h>
 
 #define	WIDTH 640