x86/coco: Require seeding RNG with RDRAND on CoCo systems

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kernel: x86/coco: Require seeding RNG with RDRAND on CoCo systems

CVE-2024-35875 addresses a security concern in the Linux kernel's handling of confidential computing CoCo environments. In these setups, the virtual machine VM host is untrusted and may attempt to compromise guest VMs. A critical component for maintaining security in such environments is a reliab...