update pixel and pixelxl to NMF26Q

BUG=skia:

Change-Id: I560fc9a7c50187897c9769d4f221d95919558a86
Reviewed-on: https://skia-review.googlesource.com/6476
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
tree: 2399b8333bb06dc4c5450126f7dc9e041adcec31
  1. recipe_modules/
  2. recipes.py
  3. recipes/