BUILD_ID: Fix build ID too long err

BUILD_ID: Fix build ID too long err

Previous change altered the BUILD_ID to include Armband commit info
instead of Fuel@OPNFV info, and also a marker to indicate it comes
from Armband repo.

This lead to the ISO volume ID becoming too long:

"Making ISO...
genisoimage: Volume ID string too long
make[1]: *** [iso] Error 255"

While at it, change our marker from "FUEL_AARCH64" to "ARMBAND_FUEL",
as our ISO should also support x86 in the future, not only arm64.

Fixes: ARMBAND-53

Change-Id: I52526f1f7861aca71d16d1e6b6b2a9566a6c7d3f
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>