Notch rules or guidelines for steel studs (non-load bearing)
International Residential Code 2009
Chapter 6 Wall Construction
Section R603 Steel Wall Framing
R603.1 General. Elements shall be straight and free of any defects that would significantly affect structural performance. Cold-formed steel wall framing members shall comply with the requirements of this section.
R603.3.4 Cutting and notching. Flanges and lips of cold-formed steel studs and headers shall not be cut or notched.

603.3.4 is a requirement of section 603, and so all cold-formed steel wall framing members must comply with it. Meaning that whether the wall is load-bearing or not, the framing members cannot be notched.