configs: move CONFIG_USB_EHCI_VF to Kconfig

Move CONFIG_USB_EHCI_VF to drivers/usb/host/Kconfig and update the one
and only user thereof being colibri_vf.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Igor Opaniuk <igor.opaniuk@toradex.com>
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index ba1e6bf..0fbc115 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -154,6 +154,13 @@
 	  Enables support for the on-chip EHCI controller on OMAP3 and later
 	  SoCs.
 
+config USB_EHCI_VF
+	bool "Support for Vybrid on-chip EHCI USB controller"
+	depends on ARCH_VF610
+	default y
+	help
+	  Enables support for the on-chip EHCI controller on Vybrid SoCs.
+
 if USB_EHCI_MX7
 
 config MXC_USB_OTG_HACTIVE