processor: remove spin_cpu_yield
spin_cpu_yield is unused, therefore remove it. Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Acked-by: NThomas Gleixner <tglx@linutronix.de> Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
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