linux: enable AMD SME, SEV, SEV-SE, SEV-SNP on x86_64

Enables the following kernel config options for AMD CPUs on x86_64:

- `CRYPTO_DEV_CCP`: Enables offloading of crypto operations to AMD's
  Cryptographic Coprocessor (CCP). Also required by `KVM_AMD_SEV`.
- `AMD_MEM_ENCRYPT`: Enables support for Secure Memory Encryption (SME).
  Please note that `AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT` is not enabled;
  yet, you you can enable memory encryption by passing `mem_encrypt=on`
  as a kernal command line option.
- `KVM_AMD_SEV`: Enables launching Encrypted VMs (SEV) and Secure VMs
  with Encrypted State (SEV-ES).
- `SEV_GUEST`: Enables support for AMD Secure Encrypted Virtualization
  with Secure Nested Paging (SEV-SNP). Built as module.

Enabling these options is in line with other distros, e.g., Debian,
Fedora or Arch Linux.

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