bblayers: add rust, remove atmel, linaro and aarch64
bblayers: add rust, remove atmel, linaro and aarch64

Change-Id: I7a2e58a271d0282e3dc6a2173e9fba89ffe75ad9
Signed-off-by: Koen Kooi <42e3d96910f922bdd7dd1805fe3f8aff634f391d@dominion.thruhere.net>

Angstrom-distribution/angstrom-manifest