staging: rtl8192e: Remove undefined function data_hard_stop

Remove function data_hard_stop as it is not defined.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/4cc180b9538d6c9c32ff0f56646a642fa217a4a4.1683960684.git.philipp.g.hortmann@gmail.com


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