cpufreq: mediatek: 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: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patch.msgid.link/20251112-b4-of-match-matchine-data-v2-3-d46b72003fd6@linaro.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Author: krzk

drivers/cpufreq/mediatek-cpufreq.c

@@ -764,22 +764,14 @@ MODULE_DEVICE_TABLE(of, mtk_cpufreq_machines);
 
 static int __init mtk_cpufreq_driver_init(void)
 {
-	struct device_node *np;
-	const struct of_device_id *match;
 	const struct mtk_cpufreq_platform_data *data;
 	int err;
 
-	np = of_find_node_by_path("/");
-	if (!np)
-		return -ENODEV;
-
-	match = of_match_node(mtk_cpufreq_machines, np);
-	of_node_put(np);
-	if (!match) {
+	data = of_machine_get_match_data(mtk_cpufreq_machines);
+	if (!data) {
 		pr_debug("Machine is not compatible with mtk-cpufreq\n");
 		return -ENODEV;
 	}
-	data = match->data;
 
 	err = platform_driver_register(&mtk_cpufreq_platdrv);
 	if (err)