soc: qcom: sys_pm_vx: Print LPM exit log and correct timestamp

Print the LPM enter/exit alternative for only timestamp lines and
no DRV vote present.

While at this also print the timestamp shifted by time shift given.

Change-Id: I03c6e45d49a6c7c0af17dc7dad4f42f8806939a6
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>