reset: img: Make reset_control_ops const

The pistachio_reset_ops structure is never modified. Make it const.

Signed-off-by: Philipp Zabel <[e-mail]>
Acked-by: James Hartley <[e-mail]>

drivers/reset/reset-pistachio.c

···
 				  mask, 0);
 }
 
-static struct reset_control_ops pistachio_reset_ops = {
+static const struct reset_control_ops pistachio_reset_ops = {
 	.assert		= pistachio_reset_assert,
 	.deassert	= pistachio_reset_deassert,
 };