staging: rtl8188eu: remove unused debugging functions

These functions were only mentioned in the rtw_proc_init_one()
function in drivers/staging/rtl8188eu/os_dep/os_intfs.c, which was
under #if 0 and has now been removed completely.

As they are not used anywhere, and also violate the coding style
rules, remove them.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Kyle Kuffermann <kyle.kuffermann@gmail.com>
Cc: Chris Elliott <chris@uksysadmin.com>
Cc: Ivan Safonov <insafonov@gmail.com>
Cc: devel@driverdev.osuosl.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>