[manifest][edgehog] Switched to branches for base and edgehog
Changed the revision for meta-seco-edgehog and seco-base to the develop branches. By setting the revision to the branches, the manifest doesn't need to be updated during active development. At a certain point, we need to fall back to a fixed revision.
Also fixed a typo in yocto_extended and did some small code clean-up / reformat.