spi: rockchip: add compatible string for rv1126

Add compatible string for rv1126 for potential applications.
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
Link: https://lore.kernel.org/r/20210621104800.19088-3-jon.lin@rock-chips.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-rockchip.c

@@ -922,6 +922,7 @@ static const struct of_device_id rockchip_spi_dt_match[] = {
 	{ .compatible = "rockchip,rk3368-spi", },
 	{ .compatible = "rockchip,rk3399-spi", },
 	{ .compatible = "rockchip,rv1108-spi", },
+	{ .compatible = "rockchip,rv1126-spi", },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, rockchip_spi_dt_match);