Revert "power: Refactors the code which prints suspend time."

This reverts 'commit 2aa40dfb ("power: Refactors the code
which prints suspend time")' which was causing race condition
when userspace tries to read last resume reason.

Conflicts:
	kernel/power/wakeup_reason.c

Change-Id: If1ed00f0b95c43362af57b27d7ffc40b34effbdf
Signed-off-by: Imran Khan <kimran@codeaurora.org>