Notify user switch event to NetworkController

When switching user NetworkController is not notified, as a result
AccessPointController won't be notified, still memorize the previous
userId which causes an unexpected AP list presentation on Wi-Fi Tile.

Improves d8c3ca43163427a75c8b70114096238177f97af0.

Bug:31235488

Change-Id: I171343dc2bcf51df26622244c4f81c48f3736faa
1 file changed