cpuidle: lpm-levels: log enabled regulators before entering suspend

Add a call to regulator_debug_print_enabled() immediately before
entering suspend.  This will print a list of all regulators that
are enabled in kernel log.

Change-Id: I532d842323fb72ef77044b5104e7b6de00748374
Signed-off-by: David Collins <collinsd@codeaurora.org>