manifest: Bring SUW to 15.1

Test cases:
1) Non-gms - pass
2) GMS w/ Pixel2 Google SetupWizard - pass

Change-Id: Ic6d86e1a08716d26299925c8db9dde768e5e7ec0
1 file changed
tree: a2cd6b0805d0b0c42bfe6345f6692c3edfb3b26c
  1. snippets/
  2. default.xml
  3. README.mkdn