Fix concurrency issues when parceling StatusBarNotifications.

Protip: Don't mess with Bundles after you've sent them off
for parceling in an RPC.

Note that this change reduces the payload size of
StatusBarNotification objects received in
onNotificationRemoved() callbacks; it scrubs out the
RemoteViews and Bitmaps just as the NoMan's internal archive
does. [You don't really need that information anyway when
hearing about a removed notification; most likely all you
need are the other slots on StatusBarNotification, but
nulling the whole Notification object breaks a lot of
clients.]

Bug: 8616295
Change-Id: Ic899045f2352b96dcf064d3e9e51dad52629aea3