counter: interrupt-cnt: Add const qualifier for functions_list array

The struct counter_count functions_list member expects a const enum
counter_count_function array. This patch adds the const qualifier to the
interrupt__cnt_functions to match functions_list.

Cc: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Link: https://lore.kernel.org/r/86f7fb77f703cf2508a6b4ee9cf80aa523392976.1623201081.git.vilhelm.gray@gmail.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/counter/interrupt-cnt.c

@@ -112,7 +112,7 @@ static int interrupt_cnt_write(struct counter_device *counter,
 	return 0;
 }
 
-static enum counter_count_function interrupt_cnt_functions[] = {
+static const enum counter_count_function interrupt_cnt_functions[] = {
 	COUNTER_COUNT_FUNCTION_INCREASE,
 };