gpio_qmsi: Use qm_gpio_save/restore_context APIs

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

Jira: ZEP-999
Change-Id: Ic7b80a8f86baa7a6be11c93bbdebb18a102b0221
Signed-off-by: JuanX Solano Menacho <juanx.solano.menacho@intel.com>