port-mbim: chain up device notifications through the port

Instead of having the modem object listen notifications in the
MbimDevice, the MMPortMbim will act as an intermediate emitter for the
same.

The primary benefit is that the lifecycle of the port object is
tightly coupled to the life of the modem object, so there is no chance
that the port object outlives the modem object.

And the port object will ensure its own device notification handler is
correctly cleared up on its dispose, so there should be no chance of
firing up a signal in the device for a listener that is already
freed.

0 files changed, 0 insertions, 0 deletions