Associate device id with getWallpaperWindow

Because we have supported multi-device event streams in the
InputDispatcher, but there are still some logics that use the previous
single-device stream logic. Here, associating getWallpaperWindow with
deviceId can solve wallpaper window is wrong issue in event transfer.

In addition to that, this patch also attempts to fix an issue where the
foreground target window with a wallpaper could not receive subsequent
remaining events after a transferTouchGesture. This is because, in
transferWallpaperTouch, we merged part of the state from the InputState
of the target foreground window into its corresponding wallpaper window,
causing the firstNewPointerIdx in its InputState to be reset. Here,
we try to resolve this issue by moving the synthesis operation of
the down event for the target foreground window to after the
transferWallpaperTouch.

Bug: 328718622
Test: atest inputflinger_tests

Change-Id: If1085c8aefd962cf1e05b7bf68d87c9f2c8bacc9
Signed-off-by: Linnan Li <lilinnan@xiaomi.corp-partner.google.com>