Add support for trogdor
One additional configuration is needed for Trogdor : Adding a .gitcookies make it possible to build the firmware on my set-up because trogdor is using private repositories.
Update: No need of this file, it seems it was an access's issue from Google side.
Signed-off-by: Mylène Josserand mylene.josserand@collabora.corp-partner.google.com