staging: r8188eu: UsbRxHighSpeedMode is set but never used

The field UsbRxHighSpeedMode of struct hal_data_8188e is set but
never used. Remove it.

Acked-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220101084937.3411-3-straube.linux@gmail.com


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