ARC: Enable HAVE_FUTEX_CMPXCHG
ARC doesn't need the runtime detection of futex cmpxchg op
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
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