phy: phy-imx8mq-usb: Add USB PHY driver for i.MX8MQ

Add the USB PHY driver for i.MX8MQ to work with DWC3 USB controller.

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Patrick Wildt <patrick@blueri.se>
Tested-by: Patrick Wildt <patrick@blueri.se>
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 008186a..09cb744 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -268,5 +268,12 @@
 	  multi-ports is first version, otherwise is second veriosn,
 	  so you can easily distinguish them by banks layout.
 
+config PHY_IMX8MQ_USB
+	bool "NXP i.MX8MQ USB PHY Driver"
+	depends on PHY
+	depends on IMX8MQ
+	help
+	  Support the USB3.0 PHY in NXP i.MX8MQ SoC
+
 source "drivers/phy/rockchip/Kconfig"
 endmenu