radeon 9200SE device id support for 2.4 and 2.6.

Hello,

Here is a smallish patch which can be added to both the 2.4 and 2.6
trees (altough the patch is against tag v2.4.24 of the linuxppc-2.4
tree).

It adds support for the Radeon 9200Se Ya, Yb, Yc and Yd variants, works
fine for me, and i think i have seen it also used by some other
debian/ppc users.

Friendly,

Sven Luther