soc: imx: imx8m-blk-ctrl: Use dev_pm_domain_attach_by_name

The genpd_dev_pm_attach_by_name() is not exported, following error
occurs when building imx8m-blk-ctrl as a module:

ERROR: modpost: "genpd_dev_pm_attach_by_name" [drivers/soc/imx/imx8m-blk-ctrl.ko] undefined!

Fix this by using dev_pm_domain_attach_by_name() instead.

Signed-off-by: Jindong Yue <jindong.yue@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: JDYue

drivers/soc/imx/imx8m-blk-ctrl.c

@@ -210,7 +210,7 @@ static int imx8m_blk_ctrl_probe(struct platform_device *pdev)
 	if (!bc->onecell_data.domains)
 		return -ENOMEM;
 
-	bc->bus_power_dev = genpd_dev_pm_attach_by_name(dev, "bus");
+	bc->bus_power_dev = dev_pm_domain_attach_by_name(dev, "bus");
 	if (IS_ERR(bc->bus_power_dev)) {
 		if (PTR_ERR(bc->bus_power_dev) == -ENODEV)
 			return dev_err_probe(dev, -EPROBE_DEFER,