rtc: qmsi: Adds device suspend/resume to rtc_qmsi device

This adds some basic suspend/resume support in the rtc qmsi
driver. This is part of a change to enable device suspend/resume
and Deep Sleep support in sample application.

Jira: ZEP-512
Change-Id: I79ccfb56de5b3cbfb5bc91e9cacca68554aa46ee
Signed-off-by: Ramesh Thomas <ramesh.thomas@intel.com>