It's just a dumb wrapper around PrivsElevated(), and also just called in few
places, while others call PrivsElevated() directly - thus not needed and
can be dropped.
Note that it's also not called by drivers, so the export was unnecessary.
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1324>