The layers has been renamed to offer a more meanful name schema;
basically:

 - meta-fsl-arm -> meta-freescale (and it includes meta-fsl-ppc)
 - meta-fsl-arm-extra -> meta-freescale-3rdparty
 - meta-fsl-demos -> meta-freescale-distro

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>