disable unsolicited 3GPP events during quick suspend/resume

For phones quick suspend/resume was created so the modem can resume quickly not to lose calls. The suspend part initially did not do anything yet. This change will disable unsolicited events when going to quick suspend, so the modem will not wake up the phone on RSSI changes and such. During quick resume the unsolicited events are enabled again.

Tagging @dylanvanassche from original quick suspend/resume implementation, and @aleksm for comments.