uboot-imx

usb: USB_ARCH_HAS_HCD Kconfig option removal

The USB_ARCH_HAS_HCD currently serves no purpose and adds some confusion to the
required Kconfig options that are required to have USB support.

Dropping it makes things easier and doesn't break anything, since it was unused
anyways.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>