Restrict PiP bounds to the display's min/max PiP size upon display transfer.

Since we're keeping the global dp size of the pip bounds constant while
moving pip across displays, it might be too big or small on the other
display. If this happens, snap the size to the allowed min/max size.

Fixes: 433285732
Test: atest PipDisplayTransferHandlerTest
Flag: com.android.window.flags.enable_dragging_pip_across_displays
Change-Id: I64771406a3c15bb6b4f4aa8a92d7be7e55a42567