OMAP: DSS2: move memory_read()

Move memory_read() from omap_dss_device to omap_dss_driver.

This is part of a larger patch-set, which moves the control from omapdss
driver to the display driver.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
diff --git a/drivers/video/omap2/omapfb/omapfb-ioctl.c b/drivers/video/omap2/omapfb/omapfb-ioctl.c
index 6dc9b5c..6e0186e 100644
--- a/drivers/video/omap2/omapfb/omapfb-ioctl.c
+++ b/drivers/video/omap2/omapfb/omapfb-ioctl.c
@@ -374,7 +374,7 @@
 	void *buf;
 	int r;
 
-	if (!display || !display->memory_read)
+	if (!display || !display->driver->memory_read)
 		return -ENOENT;
 
 	if (!access_ok(VERIFY_WRITE, mr->buffer, mr->buffer_size))
@@ -389,7 +389,7 @@
 		return -ENOMEM;
 	}
 
-	r = display->memory_read(display, buf, mr->buffer_size,
+	r = display->driver->memory_read(display, buf, mr->buffer_size,
 			mr->x, mr->y, mr->w, mr->h);
 
 	if (r > 0) {