backlight: move hp680-bl's probe function to .devinit.text

A pointer to hp680bl_probe is passed to the core via
platform_driver_register and so the function must not disappear when the
.init sections are discarded.  Otherwise (if also having HOTPLUG=y)
unbinding and binding a device to the driver via sysfs will result in an
oops as does a device being registered late.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

drivers/video/backlight/hp680_bl.c

@@ -103,7 +103,7 @@ static struct backlight_ops hp680bl_ops = {
 	.update_status  = hp680bl_set_intensity,
 };
 
-static int __init hp680bl_probe(struct platform_device *pdev)
+static int __devinit hp680bl_probe(struct platform_device *pdev)
 {
 	struct backlight_device *bd;