arm: Remove unused cpu_idle_wait()

cpuidle uses a generic function now. Remove the unused code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <linux@arm.linux.org.uk>
Link: http://lkml.kernel.org/r/20120507175652.260797846@linutronix.de

diff --cc arch/arm/Kconfig
Simple merge

diff --cc arch/arm/include/asm/processor.h
Simple merge

diff --cc arch/arm/kernel/process.c
Simple merge