staging: r8188eu: merge rtw_{os,}_indicate_disconnect()

staging: r8188eu: merge rtw_{os,}_indicate_disconnect()

Merge rtw_os_indicate_disconnect() into rtw_indicate_disconnect().
The function rtw_os_indicate_disconnect() was moved from the os_dep
directory. It looks like the driver was originaly written to support
different operating systems. We do not need this wrapping into an
extra _os_ function obviously.

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/20220819125428.8412-9-straube.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>