staging: r8188eu: remove os_dep/mlme_linux.c

staging: r8188eu: remove os_dep/mlme_linux.c

The function rtw_init_mlme_timer() is only used in core/rtw_mlme.c.
Move rtw_init_mlme_timer(), including the static functions it calls,
to core/rtw_mlme.c and make it static. Remove the now empty file
os_dep/mlme_linux.c.

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220831053639.8559-3-straube.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>