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Call railgate and unrailgate ops only if they are defined. Change-Id: I0a87ac0259af3719098d4372be7e25f0a54416fc Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-on: http://git-master/r/396375 Reviewed-by: Automatic_Commit_Validation_User Reviewed-by: Arto Merilainen <amerilainen@nvidia.com> Reviewed-by: Bo Yan <byan@nvidia.com>