x86: remove the now unused X86_FEATURE_SYNC_RDTSC

we need to know whether RDTSC is synchronous or not.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
1 file changed