phy: qcom: qmp-usb: fix NULL-deref on runtime suspend

Commit 413db06 ("phy: qcom-qmp-usb: clean up probe initialisation")
removed most users of the platform device driver data, but mistakenly
also removed the initialisation despite the data still being used in the
runtime PM callbacks.

Restore the driver data initialisation at probe to avoid a NULL-pointer
dereference on runtime suspend.

Apparently no one uses runtime PM, which currently needs to be enabled
manually through sysfs, with this driver.

Fixes: 413db06 ("phy: qcom-qmp-usb: clean up probe initialisation")
Cc: stable@vger.kernel.org	# 6.2
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240911115253.10920-2-johan+linaro@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: jhovold

drivers/phy/qualcomm/phy-qcom-qmp-usb.c

@@ -2179,6 +2179,7 @@ static int qmp_usb_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	qmp->dev = dev;
+	dev_set_drvdata(dev, qmp);
 
 	qmp->cfg = of_device_get_match_data(dev);
 	if (!qmp->cfg)