ASoC: rockchip: pdm: add compatible for rk1808

This patch adds support for rk1808, the pdm controller
is the same as rk3308.
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/rockchip/rockchip_pdm.c

@@ -457,6 +457,8 @@ static const struct of_device_id rockchip_pdm_match[] = {
 	{ .compatible = "rockchip,pdm", },
 	{ .compatible = "rockchip,px30-pdm",
 	  .data = (void *)RK_PDM_RK3308 },
+	{ .compatible = "rockchip,rk1808-pdm",
+	  .data = (void *)RK_PDM_RK3308 },
 	{ .compatible = "rockchip,rk3308-pdm",
 	  .data = (void *)RK_PDM_RK3308 },
 	{},