redhat/configs: Move CONFIG_MITIGATION_ITS to common/generic/x86

Waiman Longrequested to merge
llong1/kernel-ark:bugs_its into os-build

CONFIG_MITIGATION_ITS is specific to x86 only. Move this config file to common/generic/x86 to be with the other x86 MITIGATION config files.

Signed-off-by: Waiman Long longman@redhat.com

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