usb: dwc3: Fix renaming SPL_USB_HOST_SUPPORT to SPL_USB_HOST

In the usb/dwc3-layerscape driver the first option should be renamed
to the latter as well. Do it.

Fix original logic in dwc3_layerscape_bind() - do not enable

Fixes: 333e4a62 ("Rename SPL_USB_HOST_SUPPORT to SPL_USB_HOST")
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@foundries.io>