soc: qcom: ipcc: Move the suspend/resume to dev_pm

The target platforms use PM_SUSPEND_TO_IDLE as its default
suspend target. Since syscore_ops's suspend/resume callbacks
are not called in this path, the IPCC driver will never be
able to log the client's details that caused the wakeup in
it's resume handler. Hence, move the suspend/resume handlers
to dev_pm_ops for better visibility.

Change-Id: I095f02217aeea5ed7c5036017a7e960e2b98757a
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>