Draft: temp/modemmanager: upgrade to latest master

There will be many new features in MM 1.18 that are useful for pmOS:

• Faster suspend/resume
• Support for WWAN subsystem for MSM8916 devices
• Support for modem on SDM845 devices
• ...

We're close to a release so package the master branch for now. This should be removed again once MM 1.18 is released.