usb: ehci-mx6: add support for i.MXRT

Add support for usb1 and usb2 present on i.IMXRT.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index bf5d82f..f34cba2 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -149,7 +149,7 @@
 
 config USB_EHCI_MX6
 	bool "Support for i.MX6/i.MX7ULP on-chip EHCI USB controller"
-	depends on ARCH_MX6 || ARCH_MX7ULP
+	depends on ARCH_MX6 || ARCH_MX7ULP || ARCH_IMXRT
 	default y
 	---help---
 	  Enables support for the on-chip EHCI controller on i.MX6 SoCs.