lpm-levels: Move cpuidle tracepoints within lpm_levels

Currently the cpuidle driver considers the mode selected by menu
governor for trace events. lpm_levels recalculates the cpu and system
modes within the enter_sleep function and overwrites the menu governor
mode selection with its decision. Due to this other modules that are
dependent on these tracepoints collect incorrect low power mode
information.

Move the tracepoint within lpm_levels such that the mode selected within
lpm-levels is correctly reported and traced.

Change-Id: I9059a107da21ceebe11ae83427d36a28cf3f1a8e
Signed-off-by: Archana Sathyakumar <asathyak@codeaurora.org>