x86: Remove x86_test_and_clear_bit_percpu()

Upon removal of the "is_idle" flag, x86_test_and_clear_bit_percpu() is no
longer used.

Signed-off-by: Len Brown <len.brown@intel.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: http://lkml.kernel.org/r/b334ae6819507e3dfc0a4b33ed974714d067eb4a.1479449716.git.len.brown@intel.com


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>