Enable ostree tests for arm64
After updating of Renesas boards in LAVA Lab with U-Boot
version 2020.04+dfsg-2co5 we are able to test all ostree-based
capabilities on Arm64 platform.
Moved all ostree tests into templates-minimal-ostree
group since
only amd64 have no full ostree support.
Enable manual and automatic AUM tests for Arm64 platform.
Edited by Denis Pynkin