Enable NITRO_ENCLAVES on RHEL

Vitaly Kuznetsovrequested to merge
vkuznets/kernel-ark:nitro_enclaves_rhel9 into os-build

Nitro Enclaves driver is enabled in RHEL8 and should remain enabled. Move the config setting from fedora/ to common/.

Signed-off-by: Vitaly Kuznetsov vkuznets@redhat.com

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