thermal/drivers/hisi: Remove bogus const from function return type

With gcc-4.1.2:

    drivers/thermal/hisi_thermal.c: In function ‘hisi_thermal_probe’:
    drivers/thermal/hisi_thermal.c:530: warning: type qualifiers ignored on function return type

Remove the "const" keyword to fix this.

Fixes: a160a465 ("thermal/drivers/hisi: Prepare to add support for other hisi platforms")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

drivers/thermal/hisi_thermal.c

@@ -527,7 +527,7 @@ static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
 static int hisi_thermal_probe(struct platform_device *pdev)
 {
 	struct hisi_thermal_data *data;
-	int const (*platform_probe)(struct hisi_thermal_data *);
+	int (*platform_probe)(struct hisi_thermal_data *);
 	struct device *dev = &pdev->dev;
 	int ret;