linux: enable RANDOM_TRUST_CPU
linux: enable RANDOM_TRUST_CPU

Allows the RDRAND instruction to seed the kernel RNG. This should lead
to faster CRNG initialization, since the kernel can use the processors
capabilities directly. This is default enabled in Debian [1] and Fedora
[2] as well.

[1]: https://salsa.debian.org/kernel-team/linux/-/blob/debian/5.10.13-1/debian/config/config#L459
[2]: https://src.fedoraproject.org/rpms/kernel/blob/rawhide/f/kernel-x86_64-fedora.config#_4907

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