redhat: set aarch64 variants of kernel-rt as Tech Preview

Luis Claudio R. Goncalvesrequested to merge
lgoncalv/centos-stream-10:c10s__RTonARM_as_TechPreview into main

JIRA: https://issues.redhat.com/browse/RHEL-77120
Upstream status: RHEL only

Set the aarch64 kernel-rt-* builds, all variants, as Tech Preview.
That includes production, debug and the new 64Kpages variants.

Signed-off-by: Luis Claudio R. Goncalves lgoncalv@redhat.com

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