fsl-default-revisions: sets default versions for packages
* If there is multiple recipe descriptor for package, this
file provides information on the preferred version.
* For packages that fecth its source code from a git repo
the package version can be set to match a branch.
* This file set u-boot-imx and linux-imx preferred version
to AUTO meaning that if the source is fetched from a git
repo the version will be the default branch.
Signed-off-by: Adrian Alonso <b38018@freescale.com>