kernel: x86/fpu: Keep xfd_state in sync with MSR_IA32_XFD

In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Keep xfdstate in sync with MSRIA32XFD The Linux kernel CVE team has assigned CVE-2024-35801 to this issue. Upstream advisory: https://lore.kernel.org/linux-cve-announce/2024051738-CVE-2024-35801-8038@gregkh/T...