drm/xe: Bring some consistency on the header's endif.

While I noticed I was not consistent myself on the headers I was adding, I noticed that there were more missed comments. Then, while adding them I noticed there were many with tabs instead of space.

Let's make all to be consistent so whenever we copy the header around to start a new one we don't propagate the inconsistency.

Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com