counter: ti-eqep: Convert to counter_priv() wrapper

This is a straight forward conversion to the new counter_priv() wrapper.
Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Acked-by: David Lechner <david@lechnology.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20211230150300.72196-11-u.kleine-koenig@pengutronix.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/counter/ti-eqep.c

@@ -89,7 +89,7 @@ struct ti_eqep_cnt {
 
 static struct ti_eqep_cnt *ti_eqep_count_from_counter(struct counter_device *counter)
 {
-	return container_of(counter, struct ti_eqep_cnt, counter);
+	return counter_priv(counter);
 }
 
 static int ti_eqep_count_read(struct counter_device *counter,