clk: mediatek: mt2712-apmixedsys: Add .remove() callback for module build

Add a .remove() callback to the apmixedsys driver to allow full module
build; while at it, also change the usage of builtin_platform_driver()
to module_platform_driver() to actually make use of the new callback.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20230306140543.1813621-10-angelogioacchino.delregno@collabora.comSigned-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/mediatek/clk-mt2712-apmixedsys.c

@@ -138,6 +138,18 @@ static int clk_mt2712_apmixed_probe(struct platform_device *pdev)
 	return r;
 }
 
+static int clk_mt2712_apmixed_remove(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct clk_hw_onecell_data *clk_data = platform_get_drvdata(pdev);
+
+	of_clk_del_provider(node);
+	mtk_clk_unregister_plls(plls, ARRAY_SIZE(plls), clk_data);
+	mtk_free_clk_data(clk_data);
+
+	return 0;
+}
+
 static const struct of_device_id of_match_clk_mt2712_apmixed[] = {
 	{ .compatible = "mediatek,mt2712-apmixedsys" },
 	{ /* sentinel */ }
@@ -145,9 +157,10 @@ static const struct of_device_id of_match_clk_mt2712_apmixed[] = {
 
 static struct platform_driver clk_mt2712_apmixed_drv = {
 	.probe = clk_mt2712_apmixed_probe,
+	.remove = clk_mt2712_apmixed_remove,
 	.driver = {
 		.name = "clk-mt2712-apmixed",
 		.of_match_table = of_match_clk_mt2712_apmixed,
 	},
 };
-builtin_platform_driver(clk_mt2712_apmixed_drv)
+module_platform_driver(clk_mt2712_apmixed_drv)