staging: r8188eu: remove HW_VAR_BASIC_RATE from GetHwReg8188EU()

GetHwReg8188EU() is never called with HW_VAR_BASIC_RATE. Remove that
case from the function.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220107215033.12257-2-straube.linux@gmail.com


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