Introduce support for U-Boot for Airoha EN7581/AN7583. For EN7581
initial patch are already in U-Boot mainline and doesn't require
backport, for AN7583 some patch are still pending but already posted
upstream.
Also add for now, precompiled binary for ATF BL2 and BL31. Support for
ATF is planned and will come later.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
(cherry picked from commit 04f6769a4a87ed6de4c8a875d35743ca1783e947)
(cherry picked from commit 507bd4c77520af2bf68406654b4b9e146c27b4a6)
ca5bba26f1