README: Replace the github README file by yocto one

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>
LICENSE: Change the license, using yocto one

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>
layer.conf: It is now a yocto project meta layer

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>