staging: r8188eu: remove CONFIG_USB_HCI from Makefile

We already depend on USB. There's no need to set CONFIG_USB_HCI in the
Makefile.

Some other Realtek drivers use #ifdef CONFIG_USB_HCI in their code, the
r8188 driver doesn't.

Acked-by: Phillip Potter <phil@philpotter.co.uk>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210811201450.31366-5-martin@kaiser.cx


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>