soundwire: qcom: add v1.5.1 compatible

Add a compatible string for HW version v1.5.1 on sm8250 SoCs.
Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200905173905.16541-5-jonathan@marek.caSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/soundwire/qcom,sdw.txt

@@ -11,6 +11,7 @@ board specific bus parameters.
 		    Example:
 			"qcom,soundwire-v1.3.0"
 			"qcom,soundwire-v1.5.0"
+			"qcom,soundwire-v1.5.1"
 			"qcom,soundwire-v1.6.0"
 - reg:
 	Usage: required

drivers/soundwire/qcom.c

@@ -880,6 +880,7 @@ static int qcom_swrm_remove(struct platform_device *pdev)
 
 static const struct of_device_id qcom_swrm_of_match[] = {
 	{ .compatible = "qcom,soundwire-v1.3.0", },
+	{ .compatible = "qcom,soundwire-v1.5.1", },
 	{/* sentinel */},
 };