[media] omap_vout: use omapdss's version instead of cpu_is_*

cpu_is_* class functions create a dependency to OMAP platform code.
omapdss driver, which omap_vout uses, exposes a function to get the
version of the DSS hardware.

To remove the dependency to OMAP platform code this patch changes
omap_vout to use the omapdss version. For most of the checks, the ones
dealing with DSS differences, this is actually more correct than using
cpu_is_* functions. For the check whether VRFB is available or not this
is not really correct, but still works fine.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/platform/omap/omap_voutlib.h b/drivers/media/platform/omap/omap_voutlib.h
index e51750a..f9d1c07 100644
--- a/drivers/media/platform/omap/omap_voutlib.h
+++ b/drivers/media/platform/omap/omap_voutlib.h
@@ -32,5 +32,8 @@
 		struct v4l2_window *win);
 unsigned long omap_vout_alloc_buffer(u32 buf_size, u32 *phys_addr);
 void omap_vout_free_buffer(unsigned long virtaddr, u32 buf_size);
+
+bool omap_vout_dss_omap24xx(void);
+bool omap_vout_dss_omap34xx(void);
 #endif	/* #ifndef OMAP_VOUTLIB_H */