clk: meson-sm1: add compatible

The SM1 clock controller is almost identical to the G12A and
so far the differences don't matter.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

drivers/clk/meson/g12a.c

@@ -992,6 +992,7 @@ static struct clk_ops meson_clk_ops = {
 static const struct udevice_id meson_clk_ids[] = {
 	{ .compatible = "amlogic,g12a-clkc" },
 	{ .compatible = "amlogic,g12b-clkc" },
+	{ .compatible = "amlogic,sm1-clkc" },
 	{ }
 };