clk: mediatek: mt7988: support alternative compatible for fixed-plls

Support alternative compatible for fixed-plls clocks used upstream with
the compatible mediatek,mt7988-apmixedsys.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
diff --git a/drivers/clk/mediatek/clk-mt7988.c b/drivers/clk/mediatek/clk-mt7988.c
index 34e7b2d..32b0451 100644
--- a/drivers/clk/mediatek/clk-mt7988.c
+++ b/drivers/clk/mediatek/clk-mt7988.c
@@ -833,6 +833,7 @@
 
 static const struct udevice_id mt7988_fixed_pll_compat[] = {
 	{ .compatible = "mediatek,mt7988-fixed-plls" },
+	{ .compatible = "mediatek,mt7988-apmixedsys" },
 	{}
 };