ta: Make arm64 RPM verify jobs non-voting

arm64 RPM builds are not yet ready for all projects, yielding false
verify job failures, so make them non-voting, at least until we
finish upstreaming all the required changes for TA RPMs to build
on aarch64.

build-tools/manifest/rpmbuilder verify jobs will remain as voting
jobs, since they should already work fine on aarch64.

Change-Id: I6549edbc409017d031dcc46020034033a9e58a20
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>