x86/fpu: Make os_xrstor_booting() private
It's only required in the xstate init code. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20211015011539.455836597@linutronix.de
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