Committer needed: x11/nvidia hybrid graphics and legacy system fixes

[Theron]

x11/nvidia-hybrid-graphics: xorg rc script broken since 88b0ae2bb9c6
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266245

x11/nvidia-xconfig: add compatible version with legacy driver
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266247