Update manifest with new kernel repos

New kernel repos are being utilized for the following reasons:
- Avoid nesting or using multiple branches within the same repo (issues
with PDK)
- Make development similar to other Brillo repo i.e. main development
happens on "master" branch

BUG: 26879767
1 file changed
tree: efd5e4292b5cb4264392d2bb7c2d286c0519b352
  1. default.xml