power: constify of_device_id array

of_device_id is always used as const.
(See driver.of_match_table and open firmware functions)

Signed-off-by: Fabian Frederick <fabf@skynet.be>

[for vexpress]
Acked-by: Sudeep Holla <sudeep.holla@arm.com>

Signed-off-by: Sebastian Reichel <sre@kernel.org>
diff --git a/drivers/power/tps65090-charger.c b/drivers/power/tps65090-charger.c
index dcf9a3c..7e8fbd2 100644
--- a/drivers/power/tps65090-charger.c
+++ b/drivers/power/tps65090-charger.c
@@ -349,7 +349,7 @@
 	return 0;
 }
 
-static struct of_device_id of_tps65090_charger_match[] = {
+static const struct of_device_id of_tps65090_charger_match[] = {
 	{ .compatible = "ti,tps65090-charger", },
 	{ /* end */ }
 };