redhat/configs: Enable Nitro Enclaves on x86/aarch64

Vitaly Kuznetsovrequested to merge
vkuznets/kernel-ark:nitro_enclaves_aarch64 into os-build
  1. Enable Nitro Enclaves on x86_64 for real by enabling CONFIG_VIRT_DRIVERS.
  2. Enable Nitro Enclaves on aarch64.

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

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