patches: Add backports

Specifically

  backport/docs-Fix-typo-in-virt-qemu-sev-validate-1.patch
  backport/tools-Fix-interpreter-for-virt-qemu-sev-validate.patch
  backport/tools-Fix-style-issues-in-virt-qemu-sev-validate.patch

which address a number of issues in virt-qemu-sev-validate.