intel/decode: fix the reference file for

I mistakenly "fixed" a bad decode with

commit 7d0a1d5e
Author: Ben Widawsky <ben@bwidawsk.net>
Date:   Sun Jun 24 20:35:57 2012 -0700

    intel/decode: VERTEX_ELEMENT_STATE, 1 means valid

However the actual fix is just to update the reference file, and
include GEN7 in the decode.

Props to Eric Anholt for putting the test in distcheck, or else I
wouldn't have caught this.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>