arm64: Remove TIF_POLLING_NRFLAG

The only idle method for arm64 is WFI and it therefore
unconditionally requires the reschedule interrupt when idle.

Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: http://lkml.kernel.org/r/20140509170649.GG13658@twins.programming.kicks-ass.net


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Git-commit: 842514849a616e9b61acad65771c7afe01e651f9
[joonwoop@codeaurora.org: fixed trivial merge conflict.]
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>