Peppy/Falco: always use native graphics

The products having shipped, and living in their own branch,
we might as well enable native graphics since:
1. it works
2. it removes a blob and the only good blob is a dead blob
3. it's faster
4. when we have problems, we can diagnose them more easily
5. when we get to newer kernels the boot time will magically get faster
as the driver realizes graphics is running. Where else do you get a 3-4 second
speedup for free?

Change-Id: Iad937320e7f46b1de7ab00dace04115a7f182ed1
Signed-off-by: Ronald G. Minnich <rminnich@google.com>
Reviewed-on: https://chromium-review.googlesource.com/181225
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Commit-Queue: Ronald Minnich <rminnich@chromium.org>
Tested-by: Ronald Minnich <rminnich@chromium.org>
(cherry picked from commit 7b567d87a9fcf6736e90e730bd052e4465d57bdf)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6912
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins)