Fix regression in remote views.

Now remote views contain the application info for the app on whose
behalf they should show content. The application info contains the
user id and the package name which makes it unique in the multi
user environment. If the app which creates the remote views does
not have the same package as the one passed in the contructor of
the remote views, we lookup the app info for the target package.
There is a special hidden overload that allows creating a remote
views instance that represents an app in given package and user
(requires interact across users) permission. The latter is used
by SystemUi when creating remote views for apps that posted a
notification.

bug:16838651

Change-Id: I2daa974629f89a2446848e59300d994dadcf4439