soc: qcom: watchdog-v2: Update last_pet during the suspend and resume

Currently last_pet time variable is not updated properly during
the device suspend and resume. When watchdog bark is reported,
last_pet does not have proper value and leading to
misinterpretation on watchdog's last pet. Hence update
the last_pet during the suspend and resume.

Change-Id: I92b8b15e0830985415b3a3910c23c5aa3bebd6b3
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>