rtc_qmsi: Update save/restore implemntation with new qmsi APIs

This commit updates the rtc_qmsi driver by modifying the temporary
Zephyr save/restore context implementation and using the new QMSI APIs.

Jira: ZEP-1000
Change-Id: I6f77fe086ea6415a5bc2b2b21874c8a573fd7b44
Signed-off-by: JuanX Solano Menacho <juanx.solano.menacho@intel.com>
Signed-off-by: Iván Briano <ivan.briano@intel.com>