staging: r8188eu: AntCombination is always 2

AntCombination is initialized with 2 and never changed. Remove
resulting dead code.

Acked-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211205151251.6861-11-martin@kaiser.cx


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