edison: make u-boot-edison the preferred bootloader
edison: make u-boot-edison the preferred bootloader

Signed-off-by: Koen Kooi <42e3d96910f922bdd7dd1805fe3f8aff634f391d@dominion.thruhere.net>

wrobell/meta-edison,koenkooi/meta-edison,koenkooi/meta-edison,wrobell/meta-edison