USB: fix HCD Kconfig goofage

Add a missing dependency which goofs up the xconfig display.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/Kconfig

@@ -79,6 +79,7 @@ config USB_EHCI_BIG_ENDIAN_DESC
 
 config USB_EHCI_FSL
 	bool
+	depends on USB_EHCI_HCD
 	select USB_EHCI_ROOT_HUB_TT
 	default y if MPC834x || PPC_MPC831x
 	---help---