staging: rtl8192e: Remove undefined function hard_start_xmit

Remove function hard_start_xmit as it is not defined. Equation
!ieee->hard_start_xmit always evaluates to true. When
(*ieee->hard_start_xmit)(txb, dev) == 0 is called the my computer is
freezing.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/603a143ba506ca031d7bd70a844b9f080872d601.1683960684.git.philipp.g.hortmann@gmail.com


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