Normal. Mine is a 2011 built 5/11 purchased in 6/11. Looks just like yours. Looked under my '96 Suburban and there is some there too but not as much as it doesn't have the same cross plate visible but it is on the Steering column and some other brackets.

I would bet you wouldn't see this on a Mercedes, Lexus or Porsche. I think for the price that we pay for these vehicles there is margin to throw some paint at things under the dash.

But what do you do...