ARM: OMAP2+: PM: Denote the cpuidle tracepoints as _rcuidle()

The cpuidle tracepoints are called within a rcu_idle_exit() section, and
must be denoted with the _rcuidle() version of the tracepoint.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>