staging: r8188eu: rename rtw_os_xmit_complete()

staging: r8188eu: rename rtw_os_xmit_complete()

The function rtw_os_xmit_complete() was moved from the os_dep
directory. It looks like the driver was originaly written to support
different operating systems. Obviously we do not need an extra 'os'
in the function name that indicates that the function is operating
system specific. Rename it to rtw_xmit_complete().

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/20220820181623.12497-16-straube.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>