ASoC: rockchip: i2s: Fix the debug level on missing pinctrl

Use dev_dbg on missing i2s->pinctrl as the pinctrl property is optional.

Fixes: 44f362c2 ("ASoC: rockchip: i2s: switch BCLK to GPIO")
Signed-off-by: Judy Hsiao <judyhsiao@chromium.org>
Link: https://lore.kernel.org/r/20220629080345.2427872-1-judyhsiao@chromium.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/rockchip/rockchip_i2s.c

@@ -812,7 +812,7 @@ static int rockchip_i2s_probe(struct platform_device *pdev)
 			}
 		}
 	} else {
-		dev_err(&pdev->dev, "failed to find i2s pinctrl\n");
+		dev_dbg(&pdev->dev, "failed to find i2s pinctrl\n");
 	}
 
 	i2s_pinctrl_select_bclk_off(i2s);