CLSA-2025-1751551161 Update of grub2

Improve Xen detection so we don't set GRUBENABLEBLSCFG=false for HVM domU guests - Debrand for Cloudlinux...

CLSA-2024-1713864372 Update of grub2

Improve Xen detection so we don't set GRUBENABLEBLSCFG=false for HVM domU guests...