KVM: VMX: Bury Intel PT virtualization (guest/host mode) behind CONFIG_BROKEN

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CVE-2024-53135

CVE-2024-53135 concerns the Linux kernel KVM and Intel PT virtualization in guest/host mode. The fix hides pt_mode behind CONFIG_BROKEN to disable virtualization of Intel PT unless BROKEN=y, due to numerous bugs that can affect guest stability and host health. The described issues include: for th...