irqchip/atmel-aic: Simplify with of_machine_get_match_data()

Replace open-coded getting root OF node, matching against it and getting
the match data with new of_machine_get_match_data() helper.

Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patch.msgid.link/20251112-b4-of-match-matchine-data-v2-7-d46b72003fd6@linaro.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Author: krzk

drivers/irqchip/irq-atmel-aic-common.c

@@ -187,20 +187,11 @@ void __init aic_common_rtt_irq_fixup(void)
 
 static void __init aic_common_irq_fixup(const struct of_device_id *matches)
 {
-	struct device_node *root = of_find_node_by_path("/");
-	const struct of_device_id *match;
+	void (*fixup)(void);
 
-	if (!root)
-		return;
-
-	match = of_match_node(matches, root);
-
-	if (match) {
-		void (*fixup)(void) = match->data;
+	fixup = of_machine_get_match_data(matches);
+	if (fixup)
 		fixup();
-	}
-
-	of_node_put(root);
 }
 
 struct irq_domain *__init aic_common_of_init(struct device_node *node,