usb: ehci-mx6: Add iMX8M support

The iMX8M uses nop PHY, select PHY and NOP_PHY automatically.
Otherwise, the DM capable driver is now perfectly compatible.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Ye Li <ye.li@nxp.com>
Cc: uboot-imx <uboot-imx@nxp.com>
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 0971a7c..bf5d82f 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -156,7 +156,9 @@
 
 config USB_EHCI_MX7
 	bool "Support for i.MX7 on-chip EHCI USB controller"
-	depends on ARCH_MX7
+	depends on ARCH_MX7 || IMX8M
+	select PHY if IMX8M
+	select NOP_PHY if IMX8M
 	default y
 	---help---
 	  Enables support for the on-chip EHCI controller on i.MX7 SoCs.