staging: r8188eu: remove cmd_osdep.h header file

All functions declared in the cmd_osdep.h header file are only used in
a single c source file. Make the functions static and remove the header
file and its includes.

Acked-by: Phillip Potter <phil@philpotter.co.uk>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210821155151.25822-1-straube.linux@gmail.com


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