staging: r8188eu: remove GetHalODMVarHandler from hal_ops

Remove GetHalODMVarHandler from hal_ops ant remove its wrapper
rtw_hal_get_odm_var(), both are unused.

Acked-by: Phillip Potter <phil@philpotter.co.uk>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210904124033.14244-6-straube.linux@gmail.com


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