For the meta-freescale sumo branch, change the branch of
openembedded-core this layer depends on.
Change-Id: I83866ee7fec8cae6090b0b096aecd3f6adeb04cc Signed-off-by: Bas Mevissen <abuse@basmevissen.nl> Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>