soc: bcm: bcm2835-pm: Make local symbol static

Fixes the following sparse warning:

drivers/soc/bcm/bcm2835-power.c:556:32: warning:
 symbol 'bcm2835_reset_ops' was not declared. Should it be static?

Fixes: 670c6726 ("soc: bcm: bcm2835-pm: Add support for power domains under a new binding.")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

drivers/soc/bcm/bcm2835-power.c

@@ -553,7 +553,7 @@ static int bcm2835_reset_status(struct reset_controller_dev *rcdev,
 	}
 }
 
-const struct reset_control_ops bcm2835_reset_ops = {
+static const struct reset_control_ops bcm2835_reset_ops = {
 	.reset = bcm2835_reset_reset,
 	.status = bcm2835_reset_status,
 };