soundwire: qcom: make reset optional for v1.6 controller

On Some Qualcomm SOCs like sc8280xp which uses v1.6 soundwire controller
reset is not mandatory, so make this an optional one.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20221026110210.6575-5-srinivas.kandagatla@linaro.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/qcom.c

@@ -1321,8 +1321,8 @@ static int qcom_swrm_probe(struct platform_device *pdev)
 	}
 
 	if (data->sw_clk_gate_required) {
-		ctrl->audio_cgcr = devm_reset_control_get_exclusive(dev, "swr_audio_cgcr");
-		if (IS_ERR_OR_NULL(ctrl->audio_cgcr)) {
+		ctrl->audio_cgcr = devm_reset_control_get_optional_exclusive(dev, "swr_audio_cgcr");
+		if (IS_ERR(ctrl->audio_cgcr)) {
 			dev_err(dev, "Failed to get cgcr reset ctrl required for SW gating\n");
 			ret = PTR_ERR(ctrl->audio_cgcr);
 			goto err_init;